Use g_list_free_full to free draw_queue and draw_queue_2pass
[geeqie.git] / src / dupe.cc
index edc8e3a..dc86cb8 100644 (file)
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#include <inttypes.h>
-
-#include "main.h"
 #include "dupe.h"
 
+#include <sys/time.h>
+#include <sys/types.h>
+
+#include <cinttypes>
+#include <cmath>
+#include <cstdlib>
+#include <cstring>
+
+#include <gdk/gdk.h>
+#include <gio/gio.h>
+#include <glib-object.h>
+
 #include "cache.h"
 #include "collect-table.h"
+#include "collect.h"
+#include "compat.h"
+#include "debug.h"
 #include "dnd.h"
 #include "filedata.h"
 #include "history-list.h"
 #include "image-load.h"
 #include "img-view.h"
+#include "intl.h"
 #include "layout-image.h"
 #include "layout-util.h"
+#include "layout.h"
+#include "main-defines.h"
 #include "md5-util.h"
 #include "menu.h"
 #include "misc.h"
-#include "pixbuf-util.h"
+#include "options.h"
 #include "print.h"
+#include "similar.h"
 #include "thumb.h"
+#include "typedefs.h"
 #include "ui-fileops.h"
 #include "ui-menu.h"
 #include "ui-misc.h"
 #include "ui-tree-edit.h"
+#include "ui-utildlg.h"
 #include "uri-utils.h"
 #include "utilops.h"
 #include "window.h"
 
-#include <math.h>
-
-
-#define DUPE_DEF_WIDTH 800
-#define DUPE_DEF_HEIGHT 400
+enum {
+       DUPE_DEF_WIDTH = 800,
+       DUPE_DEF_HEIGHT = 400
+};
 #define DUPE_PROGRESS_PULSE_STEP 0.0001
 
 /** column assignment order (simply change them here)
@@ -70,17 +87,16 @@ enum {
        DUPE_COLUMN_COUNT       /**< total columns */
 };
 
-typedef enum {
+enum DUPE_CHECK_RESULT {
        DUPE_MATCH = 0,
        DUPE_NO_MATCH,
        DUPE_NAME_MATCH
-} DUPE_CHECK_RESULT;
+};
 
-typedef struct _DupeQueueItem DupeQueueItem;
 /** Used for similarity checks. One for each item pushed
  * onto the thread pool.
  */
-struct _DupeQueueItem
+struct DupeQueueItem
 {
        DupeItem *needle;
        DupeWindow *dw;
@@ -88,10 +104,9 @@ struct _DupeQueueItem
        gint index; /**< The order items pushed onto thread pool. Used to sort returned matches */
 };
 
-typedef struct _DupeSearchMatch DupeSearchMatch;
 /** Used for similarity checks thread. One for each pair match found.
  */
-struct _DupeSearchMatch
+struct DupeSearchMatch
 {
        DupeItem *a; /**< \a a / \a b matched pair found */
        DupeItem *b; /**< \a a / \a b matched pair found */
@@ -100,7 +115,7 @@ struct _DupeSearchMatch
 };
 
 static DupeMatchType param_match_mask;
-static GList *dupe_window_list = NULL; /**< list of open DupeWindow *s */
+static GList *dupe_window_list = nullptr;      /**< list of open DupeWindow *s */
 
 /*
  * Well, after adding the 'compare two sets' option things got a little sloppy in here
@@ -147,27 +162,27 @@ hard_coded_window_keys dupe_window_keys[] = {
        {GDK_CONTROL_MASK, 'R', N_("Rename")},
        {GDK_CONTROL_MASK, 'D', N_("Move to Trash")},
        {GDK_SHIFT_MASK, GDK_KEY_Delete, N_("Delete")},
-       {0, GDK_KEY_Delete, N_("Remove")},
+       {static_cast<GdkModifierType>(0), GDK_KEY_Delete, N_("Remove")},
        {GDK_CONTROL_MASK, GDK_KEY_Delete, N_("Clear")},
        {GDK_CONTROL_MASK, 'A', N_("Select all")},
-       {GDK_CONTROL_MASK + GDK_SHIFT_MASK, 'A', N_("Select none")},
+       {static_cast<GdkModifierType>(GDK_CONTROL_MASK + GDK_SHIFT_MASK), 'A', N_("Select none")},
        {GDK_CONTROL_MASK, 'T', N_("Toggle thumbs")},
        {GDK_CONTROL_MASK, 'W', N_("Close window")},
-       {0, GDK_KEY_Return, N_("View")},
-       {0, 'V', N_("View in new window")},
-       {0, 'C', N_("Collection from selection")},
+       {static_cast<GdkModifierType>(0), GDK_KEY_Return, N_("View")},
+       {static_cast<GdkModifierType>(0), 'V', N_("View in new window")},
+       {static_cast<GdkModifierType>(0), 'C', N_("Collection from selection")},
        {GDK_CONTROL_MASK, 'L', N_("Append list")},
-       {0, '0', N_("Select none")},
-       {0, '1', N_("Select group 1 duplicates")},
-       {0, '2', N_("Select group 2 duplicates")},
-       {0, 0, NULL}
+       {static_cast<GdkModifierType>(0), '0', N_("Select none")},
+       {static_cast<GdkModifierType>(0), '1', N_("Select group 1 duplicates")},
+       {static_cast<GdkModifierType>(0), '2', N_("Select group 2 duplicates")},
+       {static_cast<GdkModifierType>(0), 0, nullptr}
 };
 
 /**
  * @brief The function run in threads for similarity checks
  * @param d1 #DupeQueueItem
  * @param d2 #DupeWindow
- * 
+ *
  * Used only for similarity checks.\n
  * Search \a dqi->list for \a dqi->needle and if a match is
  * found, create a #DupeSearchMatch and add to \a dw->search_matches list\n
@@ -175,11 +190,11 @@ hard_coded_window_keys dupe_window_keys[] = {
  */
 static void dupe_comparison_func(gpointer d1, gpointer d2)
 {
-       DupeQueueItem *dqi = static_cast<DupeQueueItem *>(d1);
-       DupeWindow *dw = static_cast<DupeWindow *>(d2);
+       auto dqi = static_cast<DupeQueueItem *>(d1);
+       auto dw = static_cast<DupeWindow *>(d2);
        DupeSearchMatch *dsm;
        DupeItem *di;
-       GList *matches = NULL;
+       GList *matches = nullptr;
        gdouble rank = 0;
 
        if (!dw->abort)
@@ -235,10 +250,10 @@ static void dupe_comparison_func(gpointer d1, gpointer d2)
 
 /**
  * @brief Update display of status label
- * @param dw 
- * @param count_only 
- * 
- * 
+ * @param dw
+ * @param count_only
+ *
+ *
  */
 static void dupe_window_update_count(DupeWindow *dw, gboolean count_only)
 {
@@ -270,17 +285,17 @@ static void dupe_window_update_count(DupeWindow *dw, gboolean count_only)
 
 /**
  * @brief Returns time in µsec since Epoch
- * @returns 
- * 
- * 
+ * @returns
+ *
+ *
  */
-static guint64 msec_time(void)
+static guint64 msec_time()
 {
        struct timeval tv;
 
-       if (gettimeofday(&tv, NULL) == -1) return 0;
+       if (gettimeofday(&tv, nullptr) == -1) return 0;
 
-       return (guint64)tv.tv_sec * 1000000 + (guint64)tv.tv_usec;
+       return static_cast<guint64>(tv.tv_sec) * 1000000 + static_cast<guint64>(tv.tv_usec);
 }
 
 static gint dupe_iterations(gint n)
@@ -289,14 +304,14 @@ static gint dupe_iterations(gint n)
 }
 
 /**
- * @brief 
- * @param dw 
- * @param status 
- * @param value 
- * @param force 
- * 
+ * @brief
+ * @param dw
+ * @param status
+ * @param value
+ * @param force
+ *
  * If \a status is blank, clear status bar text and set progress to zero. \n
- * If \a force is not set, after 2 secs has elapsed, update time-to-go every 250 ms. 
+ * If \a force is not set, after 2 secs has elapsed, update time-to-go every 250 ms.
  */
 static void dupe_window_update_progress(DupeWindow *dw, const gchar *status, gdouble value, gboolean force)
 {
@@ -343,7 +358,7 @@ static void dupe_window_update_progress(DupeWindow *dw, const gchar *status, gdo
                                d = dw->setup_count - dw->setup_n;
                                }
 
-                       rem = (t - d) ? ((gdouble)(dw->setup_time_count / 1000000) / (t - d)) * d : 0;
+                       rem = (t - d) ? (static_cast<gdouble>(dw->setup_time_count / 1000000.0) / (t - d)) * d : 0;
 
                        gtk_progress_bar_set_fraction(GTK_PROGRESS_BAR(dw->extra_label), value);
 
@@ -353,7 +368,8 @@ static void dupe_window_update_progress(DupeWindow *dw, const gchar *status, gdo
 
                        return;
                        }
-               else if (force ||
+
+               if (force ||
                         value == 0.0 ||
                         dw->setup_count == 0 ||
                         dw->setup_time_count == 0 ||
@@ -366,7 +382,7 @@ static void dupe_window_update_progress(DupeWindow *dw, const gchar *status, gdo
                        }
                else
                        {
-                       status_text = NULL;
+                       status_text = nullptr;
                        }
                }
        else
@@ -381,16 +397,18 @@ static void dupe_window_update_progress(DupeWindow *dw, const gchar *status, gdo
 static void widget_set_cursor(GtkWidget *widget, gint icon)
 {
        GdkCursor *cursor;
+       GdkDisplay *display;
 
        if (!gtk_widget_get_window(widget)) return;
 
        if (icon == -1)
                {
-               cursor = NULL;
+               cursor = nullptr;
                }
        else
                {
-               cursor = gdk_cursor_new(icon);
+               display = gdk_display_get_default();
+               cursor = gdk_cursor_new_for_display(display, static_cast<GdkCursorType>(icon));
                }
 
        gdk_window_set_cursor(gtk_widget_get_window(widget), cursor);
@@ -409,7 +427,7 @@ static void dupe_listview_realign_colors(DupeWindow *dw)
        GtkTreeModel *store;
        GtkTreeIter iter;
        gboolean color_set = TRUE;
-       DupeItem *parent = NULL;
+       DupeItem *parent = nullptr;
        gboolean valid;
 
        store = gtk_tree_view_get_model(GTK_TREE_VIEW(dw->listview));
@@ -468,73 +486,56 @@ static void dupe_item_free(DupeItem *di)
        g_free(di);
 }
 
-static void dupe_list_free(GList *list)
-{
-       GList *work = list;
-       while (work)
-               {
-               DupeItem *di = static_cast<DupeItem *>(work->data);
-               work = work->next;
-               dupe_item_free(di);
-               }
-       g_list_free(list);
-}
-
-/*
-static DupeItem *dupe_item_find_fd_by_list(FileData *fd, GList *work)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-function"
+static DupeItem *dupe_item_find_fd_by_list_unused(FileData *fd, GList *work)
 {
        while (work)
                {
-               DupeItem *di = static_cast<DupeItem *>(work->data);
+               auto *di = static_cast<DupeItem *>(work->data);
 
                if (di->fd == fd) return di;
 
                work = work->next;
                }
 
-       return NULL;
+       return nullptr;
 }
-*/
 
-/*
-static DupeItem *dupe_item_find_fd(DupeWindow *dw, FileData *fd)
+static DupeItem *dupe_item_find_fd_unused(DupeWindow *dw, FileData *fd)
 {
        DupeItem *di;
 
-       di = dupe_item_find_fd_by_list(fd, dw->list);
-       if (!di && dw->second_set) di = dupe_item_find_fd_by_list(fd, dw->second_list);
+       di = dupe_item_find_fd_by_list_unused(fd, dw->list);
+       if (!di && dw->second_set) di = dupe_item_find_fd_by_list_unused(fd, dw->second_list);
 
        return di;
 }
-*/
 
-/*
-static DupeItem *dupe_item_find_path_by_list(const gchar *path, GList *work)
+static DupeItem *dupe_item_find_path_by_list_unused(const gchar *path, GList *work)
 {
        while (work)
                {
-               DupeItem *di = static_cast<DupeItem *>(work->data);
+               auto *di = static_cast<DupeItem *>(work->data);
 
                if (strcmp(di->fd->path, path) == 0) return di;
 
                work = work->next;
                }
 
-       return NULL;
+       return nullptr;
 }
-*/
 
-/*
-static DupeItem *dupe_item_find_path(DupeWindow *dw, const gchar *path)
+static DupeItem *dupe_item_find_path_unused(DupeWindow *dw, const gchar *path)
 {
        DupeItem *di;
 
-       di = dupe_item_find_path_by_list(path, dw->list);
-       if (!di && dw->second_set) di = dupe_item_find_path_by_list(path, dw->second_list);
+       di = dupe_item_find_path_by_list_unused(path, dw->list);
+       if (!di && dw->second_set) di = dupe_item_find_path_by_list_unused(path, dw->second_list);
 
        return di;
 }
-*/
+#pragma GCC diagnostic pop
 
 /*
  * ------------------------------------------------------------------
@@ -566,7 +567,7 @@ static void dupe_item_read_cache(DupeItem *di)
                if (!di->simd && cd->sim)
                        {
                        di->simd = cd->sim;
-                       cd->sim = NULL;
+                       cd->sim = nullptr;
                        }
                if (di->width == 0 && di->height == 0 && cd->dimensions)
                        {
@@ -595,7 +596,7 @@ static void dupe_item_write_cache(DupeItem *di)
                CacheData *cd;
 
                cd = cache_sim_data_new();
-               cd->path = cache_get_location(CACHE_TYPE_SIM, di->fd->path, TRUE, NULL);
+               cd->path = cache_get_location(CACHE_TYPE_SIM, di->fd->path, TRUE, nullptr);
 
                if (di->width != 0) cache_sim_data_set_dimensions(cd, di->width, di->height);
                if (di->md5sum)
@@ -665,7 +666,7 @@ static void dupe_listview_add(DupeWindow *dw, DupeItem *parent, DupeItem *child)
                if (child->group)
                        {
                        dm = static_cast<DupeMatch *>(child->group->data);
-                       rank = (gint)floor(dm->rank);
+                       rank = static_cast<gint>(floor(dm->rank));
                        }
                else
                        {
@@ -704,10 +705,10 @@ static void dupe_listview_add(DupeWindow *dw, DupeItem *parent, DupeItem *child)
                text[DUPE_COLUMN_RANK] = g_strdup_printf("%d%s", rank, (di->second) ? " (2)" : "");
                }
 
-       text[DUPE_COLUMN_THUMB] = "";
-       text[DUPE_COLUMN_NAME] = (gchar *)di->fd->name;
+       text[DUPE_COLUMN_THUMB] = nullptr;
+       text[DUPE_COLUMN_NAME] = const_cast<gchar *>(di->fd->name);
        text[DUPE_COLUMN_SIZE] = text_from_size(di->fd->size);
-       text[DUPE_COLUMN_DATE] = (gchar *)text_from_time(di->fd->date);
+       text[DUPE_COLUMN_DATE] = const_cast<gchar *>(text_from_time(di->fd->date));
        if (di->width > 0 && di->height > 0)
                {
                text[DUPE_COLUMN_DIMENSIONS] = g_strdup_printf("%d x %d", di->width, di->height);
@@ -717,7 +718,7 @@ static void dupe_listview_add(DupeWindow *dw, DupeItem *parent, DupeItem *child)
                text[DUPE_COLUMN_DIMENSIONS] = g_strdup("");
                }
        text[DUPE_COLUMN_PATH] = di->fd->path;
-       text[DUPE_COLUMN_COLOR] = NULL;
+       text[DUPE_COLUMN_COLOR] = nullptr;
 
        gtk_list_store_insert(store, &iter, row);
        gtk_list_store_set(store, &iter,
@@ -751,15 +752,15 @@ static void dupe_listview_populate(DupeWindow *dw)
        work = g_list_last(dw->dupes);
        while (work)
                {
-               DupeItem *parent = static_cast<DupeItem *>(work->data);
+               auto parent = static_cast<DupeItem *>(work->data);
                GList *temp;
 
-               dupe_listview_add(dw, parent, NULL);
+               dupe_listview_add(dw, parent, nullptr);
 
                temp = g_list_last(parent->group);
                while (temp)
                        {
-                       DupeMatch *dm = static_cast<DupeMatch *>(temp->data);
+                       auto dm = static_cast<DupeMatch *>(temp->data);
                        DupeItem *child;
 
                        child = dm->di;
@@ -800,19 +801,19 @@ static void dupe_listview_remove(DupeWindow *dw, DupeItem *di)
        tree_view_move_cursor_away(GTK_TREE_VIEW(dw->listview), &iter, TRUE);
        gtk_list_store_remove(store, &iter);
 
-       if (g_list_find(dw->dupes, di) != NULL)
+       if (g_list_find(dw->dupes, di) != nullptr)
                {
                if (!dw->color_frozen) dupe_listview_realign_colors(dw);
                }
 }
 
 
-static GList *dupe_listview_get_filelist(DupeWindow *UNUSED(dw), GtkWidget *listview)
+static GList *dupe_listview_get_filelist(DupeWindow *, GtkWidget *listview)
 {
        GtkTreeModel *store;
        GtkTreeIter iter;
        gboolean valid;
-       GList *list = NULL;
+       GList *list = nullptr;
 
        store = gtk_tree_view_get_model(GTK_TREE_VIEW(listview));
        valid = gtk_tree_model_get_iter_first(store, &iter);
@@ -829,12 +830,12 @@ static GList *dupe_listview_get_filelist(DupeWindow *UNUSED(dw), GtkWidget *list
 }
 
 
-static GList *dupe_listview_get_selection(DupeWindow *UNUSED(dw), GtkWidget *listview)
+static GList *dupe_listview_get_selection(DupeWindow *, GtkWidget *listview)
 {
        GtkTreeModel *store;
        GtkTreeSelection *selection;
        GList *slist;
-       GList *list = NULL;
+       GList *list = nullptr;
        GList *work;
 
        selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(listview));
@@ -842,8 +843,8 @@ static GList *dupe_listview_get_selection(DupeWindow *UNUSED(dw), GtkWidget *lis
        work = slist;
        while (work)
                {
-               GtkTreePath *tpath = static_cast<GtkTreePath *>(work->data);
-               DupeItem *di = NULL;
+               auto tpath = static_cast<GtkTreePath *>(work->data);
+               DupeItem *di = nullptr;
                GtkTreeIter iter;
 
                gtk_tree_model_get_iter(store, &iter, tpath);
@@ -854,13 +855,12 @@ static GList *dupe_listview_get_selection(DupeWindow *UNUSED(dw), GtkWidget *lis
                        }
                work = work->next;
                }
-       g_list_foreach(slist, (GFunc)tree_path_free_wrapper, NULL);
-       g_list_free(slist);
+       g_list_free_full(slist, reinterpret_cast<GDestroyNotify>(gtk_tree_path_free));
 
        return g_list_reverse(list);
 }
 
-static gboolean dupe_listview_item_is_selected(DupeWindow *UNUSED(dw), DupeItem *di, GtkWidget *listview)
+static gboolean dupe_listview_item_is_selected(DupeWindow *, DupeItem *di, GtkWidget *listview)
 {
        GtkTreeModel *store;
        GtkTreeSelection *selection;
@@ -873,7 +873,7 @@ static gboolean dupe_listview_item_is_selected(DupeWindow *UNUSED(dw), DupeItem
        work = slist;
        while (!found && work)
                {
-               GtkTreePath *tpath = static_cast<GtkTreePath *>(work->data);
+               auto tpath = static_cast<GtkTreePath *>(work->data);
                DupeItem *di_n;
                GtkTreeIter iter;
 
@@ -882,8 +882,7 @@ static gboolean dupe_listview_item_is_selected(DupeWindow *UNUSED(dw), DupeItem
                if (di_n == di) found = TRUE;
                work = work->next;
                }
-       g_list_foreach(slist, (GFunc)tree_path_free_wrapper, NULL);
-       g_list_free(slist);
+       g_list_free_full(slist, reinterpret_cast<GDestroyNotify>(gtk_tree_path_free));
 
        return found;
 }
@@ -934,10 +933,10 @@ static void dupe_listview_select_dupes(DupeWindow *dw, DupeSelectType parents)
 
 /**
  * @brief Search \a parent->group for \a child (#DupeItem)
- * @param child 
- * @param parent 
- * @returns 
- * 
+ * @param child
+ * @param parent
+ * @returns
+ *
  */
 static DupeMatch *dupe_match_find_match(DupeItem *child, DupeItem *parent)
 {
@@ -946,19 +945,19 @@ static DupeMatch *dupe_match_find_match(DupeItem *child, DupeItem *parent)
        work = parent->group;
        while (work)
                {
-               DupeMatch *dm = static_cast<DupeMatch *>(work->data);
+               auto dm = static_cast<DupeMatch *>(work->data);
                if (dm->di == child) return dm;
                work = work->next;
                }
-       return NULL;
+       return nullptr;
 }
 
 /**
  * @brief Create #DupeMatch structure for \a child, and insert into \a parent->group list.
- * @param child 
- * @param parent 
- * @param rank 
- * 
+ * @param child
+ * @param parent
+ * @param rank
+ *
  */
 static void dupe_match_link_child(DupeItem *child, DupeItem *parent, gdouble rank)
 {
@@ -972,10 +971,10 @@ static void dupe_match_link_child(DupeItem *child, DupeItem *parent, gdouble ran
 
 /**
  * @brief Link \a a & \a b as both parent and child
- * @param a 
- * @param b 
- * @param rank 
- * 
+ * @param a
+ * @param b
+ * @param rank
+ *
  * Link \a a as child of \a b, and \a b as child of \a a
  */
 static void dupe_match_link(DupeItem *a, DupeItem *b, gdouble rank)
@@ -986,9 +985,9 @@ static void dupe_match_link(DupeItem *a, DupeItem *b, gdouble rank)
 
 /**
  * @brief Remove \a child #DupeMatch from \a parent->group list.
- * @param child 
- * @param parent 
- * 
+ * @param child
+ * @param parent
+ *
  */
 static void dupe_match_unlink_child(DupeItem *child, DupeItem *parent)
 {
@@ -1004,8 +1003,8 @@ static void dupe_match_unlink_child(DupeItem *child, DupeItem *parent)
 
 /**
  * @brief  Unlink \a a from \a b, and \a b from \a a
- * @param a 
- * @param b 
+ * @param a
+ * @param b
  *
  * Free the relevant #DupeMatch items from the #DupeItem group lists
  */
@@ -1016,49 +1015,50 @@ static void dupe_match_unlink(DupeItem *a, DupeItem *b)
 }
 
 /**
- * @brief 
- * @param parent 
- * @param unlink_children 
- * 
+ * @brief
+ * @param parent
+ * @param unlink_children
+ *
  * If \a unlink_children is set, unlink all entries in \a parent->group list. \n
  * Free the \a parent->group list and set group_rank to zero;
  */
 static void dupe_match_link_clear(DupeItem *parent, gboolean unlink_children)
 {
-       GList *work;
-
-       work = parent->group;
-       while (work)
+       if (unlink_children)
                {
-               DupeMatch *dm = static_cast<DupeMatch *>(work->data);
-               work = work->next;
+               GList *work;
 
-               if (unlink_children) dupe_match_unlink_child(parent, dm->di);
+               work = parent->group;
+               while (work)
+                       {
+                       auto dm = static_cast<DupeMatch *>(work->data);
+                       work = work->next;
 
-               g_free(dm);
+                       dupe_match_unlink_child(parent, dm->di);
+                       }
                }
 
-       g_list_free(parent->group);
-       parent->group = NULL;
+       g_list_free_full(parent->group, g_free);
+       parent->group = nullptr;
        parent->group_rank = 0.0;
 }
 
 /**
  * @brief Search \a parent->group list for \a child
- * @param child 
- * @param parent 
+ * @param child
+ * @param parent
  * @returns boolean TRUE/FALSE found/not found
- * 
+ *
  */
 static gint dupe_match_link_exists(DupeItem *child, DupeItem *parent)
 {
-       return (dupe_match_find_match(child, parent) != NULL);
+       return (dupe_match_find_match(child, parent) != nullptr);
 }
 
 /**
  * @brief  Search \a parent->group for \a child, and return \a child->rank
- * @param child 
- * @param parent 
+ * @param child
+ * @param parent
  * @returns \a dm->di->rank
  *
  */
@@ -1074,9 +1074,9 @@ static gdouble dupe_match_link_rank(DupeItem *child, DupeItem *parent)
 
 /**
  * @brief Find highest rank in \a child->group
- * @param child 
- * @returns 
- * 
+ * @param child
+ * @returns
+ *
  * Search the #DupeMatch entries in the \a child->group list.
  * Return the #DupeItem with the highest rank. If more than one have
  * the same rank, the first encountered is used.
@@ -1086,11 +1086,11 @@ static DupeItem *dupe_match_highest_rank(DupeItem *child)
        DupeMatch *dr;
        GList *work;
 
-       dr = NULL;
+       dr = nullptr;
        work = child->group;
        while (work)
                {
-               DupeMatch *dm = static_cast<DupeMatch *>(work->data);
+               auto dm = static_cast<DupeMatch *>(work->data);
                if (!dr || dm->rank > dr->rank)
                        {
                        dr = dm;
@@ -1098,13 +1098,13 @@ static DupeItem *dupe_match_highest_rank(DupeItem *child)
                work = work->next;
                }
 
-       return (dr) ? dr->di : NULL;
+       return (dr) ? dr->di : nullptr;
 }
 
-/** 
+/**
  * @brief Compute and store \a parent->group_rank
- * @param parent 
- * 
+ * @param parent
+ *
  * Group_rank = (sum of all child ranks) / n
  */
 static void dupe_match_rank_update(DupeItem *parent)
@@ -1116,7 +1116,7 @@ static void dupe_match_rank_update(DupeItem *parent)
        work = parent->group;
        while (work)
                {
-               DupeMatch *dm = static_cast<DupeMatch *>(work->data);
+               auto dm = static_cast<DupeMatch *>(work->data);
                work = work->next;
                rank += dm->rank;
                c++;
@@ -1141,18 +1141,18 @@ static DupeItem *dupe_match_find_parent(DupeWindow *dw, DupeItem *child)
        work = child->group;
        while (work)
                {
-               DupeMatch *dm = static_cast<DupeMatch *>(work->data);
+               auto dm = static_cast<DupeMatch *>(work->data);
                if (g_list_find(dw->dupes, dm->di)) return dm->di;
                work = work->next;
                }
 
-       return NULL;
+       return nullptr;
 }
 
 /**
- * @brief 
+ * @brief
  * @param work (#DupeItem) dw->list or dw->second_list
- * 
+ *
  * Unlink all #DupeItem-s in \a work.
  * Do not unlink children.
  */
@@ -1160,7 +1160,7 @@ static void dupe_match_reset_list(GList *work)
 {
        while (work)
                {
-               DupeItem *di = static_cast<DupeItem *>(work->data);
+               auto di = static_cast<DupeItem *>(work->data);
                work = work->next;
 
                dupe_match_link_clear(di, FALSE);
@@ -1177,14 +1177,14 @@ static void dupe_match_reparent(DupeWindow *dw, DupeItem *old_parent, DupeItem *
        work = old_parent->group;
        while (work)
                {
-               DupeMatch *dm = static_cast<DupeMatch *>(work->data);
+               auto dm = static_cast<DupeMatch *>(work->data);
                dupe_match_unlink_child(old_parent, dm->di);
                dupe_match_link_child(new_parent, dm->di, dm->rank);
                work = work->next;
                }
 
        new_parent->group = old_parent->group;
-       old_parent->group = NULL;
+       old_parent->group = nullptr;
 
        work = g_list_find(dw->dupes, old_parent);
        if (work) work->data = new_parent;
@@ -1199,7 +1199,7 @@ static void dupe_match_print_group(DupeItem *di)
        work = di->group;
        while (work)
                {
-               DupeMatch *dm = static_cast<DupeMatch *>(work->data);
+               auto dm = static_cast<DupeMatch *>(work->data);
                work = work->next;
 
                log_printf("  %f %s\n", dm->rank, dm->di->fd->name);
@@ -1215,7 +1215,7 @@ static void dupe_match_print_list(GList *list)
        work = list;
        while (work)
                {
-               DupeItem *di = static_cast<DupeItem *>(work->data);
+               auto di = static_cast<DupeItem *>(work->data);
                dupe_match_print_group(di);
                work = work->next;
                }
@@ -1223,22 +1223,22 @@ static void dupe_match_print_list(GList *list)
 
 /* level 3, unlinking and orphan handling */
 /**
- * @brief 
- * @param child 
+ * @brief
+ * @param child
  * @param parent \a di from \a child->group
  * @param[inout] list \a dw->list sorted by rank (#DupeItem)
- * @param dw 
+ * @param dw
  * @returns modified \a list
  *
  * Called for each entry in \a child->group (#DupeMatch) with \a parent set to \a dm->di. \n
  * Find the highest rank #DupeItem of the \a parent's children. \n
  * If that is == \a child OR
  * highest rank #DupeItem of \a child == \a parent then FIXME:
- * 
+ *
  */
 static GList *dupe_match_unlink_by_rank(DupeItem *child, DupeItem *parent, GList *list, DupeWindow *dw)
 {
-       DupeItem *best = NULL;
+       DupeItem *best = nullptr;
 
        best = dupe_match_highest_rank(parent); // highest rank in parent->group
        if (best == child || dupe_match_highest_rank(child) == parent)
@@ -1251,7 +1251,7 @@ static GList *dupe_match_unlink_by_rank(DupeItem *child, DupeItem *parent, GList
                work = parent->group;
                while (work)
                        {
-                       DupeMatch *dm = static_cast<DupeMatch *>(work->data);
+                       auto dm = static_cast<DupeMatch *>(work->data);
                        DupeItem *orphan;
 
                        work = work->next;
@@ -1285,12 +1285,12 @@ static GList *dupe_match_unlink_by_rank(DupeItem *child, DupeItem *parent, GList
 
 /* level 2 */
 /**
- * @brief 
+ * @brief
  * @param[inout] list \a dw->list sorted by rank (#DupeItem)
- * @param di 
- * @param dw 
+ * @param di
+ * @param dw
  * @returns modified \a list
- * 
+ *
  * Called for each entry in \a list.
  * Call unlink for each child in \a di->group
  */
@@ -1301,7 +1301,7 @@ static GList *dupe_match_group_filter(GList *list, DupeItem *di, DupeWindow *dw)
        work = g_list_last(di->group);
        while (work)
                {
-               DupeMatch *dm = static_cast<DupeMatch *>(work->data);
+               auto dm = static_cast<DupeMatch *>(work->data);
                work = work->prev;
                list = dupe_match_unlink_by_rank(di, dm->di, list, dw);
                }
@@ -1311,11 +1311,11 @@ static GList *dupe_match_group_filter(GList *list, DupeItem *di, DupeWindow *dw)
 
 /* level 1 (top) */
 /**
- * @brief 
+ * @brief
  * @param[inout] list \a dw->list sorted by rank (#DupeItem)
- * @param dw 
+ * @param dw
  * @returns Filtered \a list
- * 
+ *
  * Called once.
  * Call group filter for each \a di in \a list
  */
@@ -1326,7 +1326,7 @@ static GList *dupe_match_group_trim(GList *list, DupeWindow *dw)
        work = list;
        while (work)
                {
-               DupeItem *di = static_cast<DupeItem *>(work->data);
+               auto di = static_cast<DupeItem *>(work->data);
                if (!di->second) list = dupe_match_group_filter(list, di, dw);
                work = work->next;
                if (di->second) list = g_list_remove(list, di);
@@ -1337,8 +1337,8 @@ static GList *dupe_match_group_trim(GList *list, DupeWindow *dw)
 
 static gint dupe_match_sort_groups_cb(gconstpointer a, gconstpointer b)
 {
-       DupeMatch *da = (DupeMatch *)a;
-       DupeMatch *db = (DupeMatch *)b;
+       auto da = static_cast<const DupeMatch *>(a);
+       auto db = static_cast<const DupeMatch *>(b);
 
        if (da->rank > db->rank) return -1;
        if (da->rank < db->rank) return 1;
@@ -1348,7 +1348,7 @@ static gint dupe_match_sort_groups_cb(gconstpointer a, gconstpointer b)
 /**
  * @brief Sorts the children of each #DupeItem in \a list
  * @param list #DupeItem
- * 
+ *
  * Sorts the #DupeItem->group children on rank
  */
 static void dupe_match_sort_groups(GList *list)
@@ -1358,7 +1358,7 @@ static void dupe_match_sort_groups(GList *list)
        work = list;
        while (work)
                {
-               DupeItem *di = static_cast<DupeItem *>(work->data);
+               auto di = static_cast<DupeItem *>(work->data);
                di->group = g_list_sort(di->group, dupe_match_sort_groups_cb);
                work = work->next;
                }
@@ -1366,8 +1366,8 @@ static void dupe_match_sort_groups(GList *list)
 
 static gint dupe_match_totals_sort_cb(gconstpointer a, gconstpointer b)
 {
-       DupeItem *da = (DupeItem *)a;
-       DupeItem *db = (DupeItem *)b;
+       auto da = static_cast<const DupeItem *>(a);
+       auto db = static_cast<const DupeItem *>(b);
 
        if (g_list_length(da->group) > g_list_length(db->group)) return -1;
        if (g_list_length(da->group) < g_list_length(db->group)) return 1;
@@ -1380,16 +1380,16 @@ static gint dupe_match_totals_sort_cb(gconstpointer a, gconstpointer b)
 
 /**
  * @brief Callback for group_rank sort
- * @param a 
- * @param b 
- * @returns 
- * 
- * 
+ * @param a
+ * @param b
+ * @returns
+ *
+ *
  */
 static gint dupe_match_rank_sort_cb(gconstpointer a, gconstpointer b)
 {
-       DupeItem *da = (DupeItem *)a;
-       DupeItem *db = (DupeItem *)b;
+       auto da = static_cast<const DupeItem *>(a);
+       auto db = static_cast<const DupeItem *>(b);
 
        if (da->group_rank > db->group_rank) return -1;
        if (da->group_rank < db->group_rank) return 1;
@@ -1399,7 +1399,7 @@ static gint dupe_match_rank_sort_cb(gconstpointer a, gconstpointer b)
 /**
  * @brief Sorts \a source_list by group-rank
  * @param source_list #DupeItem
- * @returns 
+ * @returns
  *
  * Computes group_rank for each #DupeItem. \n
  * Items with no group list are ignored.
@@ -1407,13 +1407,13 @@ static gint dupe_match_rank_sort_cb(gconstpointer a, gconstpointer b)
  */
 static GList *dupe_match_rank_sort(GList *source_list)
 {
-       GList *list = NULL;
+       GList *list = nullptr;
        GList *work;
 
        work = source_list;
        while (work)
                {
-               DupeItem *di = static_cast<DupeItem *>(work->data);
+               auto di = static_cast<DupeItem *>(work->data);
 
                if (di->group)
                        {
@@ -1429,10 +1429,10 @@ static GList *dupe_match_rank_sort(GList *source_list)
 
 /**
  * @brief Returns allocated GList of dupes sorted by totals
- * @param source_list 
- * @returns 
- * 
- * 
+ * @param source_list
+ * @returns
+ *
+ *
  */
 static GList *dupe_match_totals_sort(GList *source_list)
 {
@@ -1443,9 +1443,9 @@ static GList *dupe_match_totals_sort(GList *source_list)
 }
 
 /**
- * @brief 
- * @param dw 
- * 
+ * @brief
+ * @param dw
+ *
  * Called once.
  */
 static void dupe_match_rank(DupeWindow *dw)
@@ -1482,14 +1482,14 @@ static void dupe_match_rank(DupeWindow *dw)
  */
 
 /**
- * @brief 
- * @param[in] a 
- * @param[in] b 
- * @param[in] mask 
- * @param[out] rank 
- * @param[in] fast 
- * @returns 
- * 
+ * @brief
+ * @param[in] a
+ * @param[in] b
+ * @param[in] mask
+ * @param[out] rank
+ * @param[in] fast
+ * @returns
+ *
  * For similarity checks, compute rank - (similarity factor between a and b). \n
  * If rank < user-set sim value, returns FALSE.
  */
@@ -1527,15 +1527,10 @@ static gboolean dupe_match(DupeItem *a, DupeItem *b, DupeMatchType mask, gdouble
                                {
                                return TRUE;
                                }
-                       else
-                               {
-                               return FALSE;
-                               }
-                       }
-               else
-                       {
+
                        return FALSE;
                        }
+               return FALSE;
                }
        if (mask & DUPE_MATCH_NAME_CI_CONTENT)
                {
@@ -1549,15 +1544,11 @@ static gboolean dupe_match(DupeItem *a, DupeItem *b, DupeMatchType mask, gdouble
                                {
                                return TRUE;
                                }
-                       else
-                               {
-                               return FALSE;
-                               }
-                       }
-               else
-                       {
+
                        return FALSE;
                        }
+               return FALSE;
+               
                }
        if (mask & DUPE_MATCH_SIZE)
                {
@@ -1591,7 +1582,7 @@ static gboolean dupe_match(DupeItem *a, DupeItem *b, DupeMatchType mask, gdouble
 
                if (mask & DUPE_MATCH_SIM_HIGH) m = 0.95;
                else if (mask & DUPE_MATCH_SIM_MED) m = 0.90;
-               else if (mask & DUPE_MATCH_SIM_CUSTOM) m = (gdouble)options->duplicates_similarity_threshold / 100.0;
+               else if (mask & DUPE_MATCH_SIM_CUSTOM) m = static_cast<gdouble>(options->duplicates_similarity_threshold) / 100.0;
                else m = 0.85;
 
                if (fast)
@@ -1615,22 +1606,22 @@ static gboolean dupe_match(DupeItem *a, DupeItem *b, DupeMatchType mask, gdouble
 
 /**
  * @brief  Determine if there is a match
- * @param di1 
- * @param di2 
- * @param data 
+ * @param di1
+ * @param di2
+ * @param data
  * @returns DUPE_MATCH/DUPE_NO_MATCH/DUPE_NAME_MATCH
  *                     DUPE_NAME_MATCH is used for name != contents searches:
  *                                                     the name and content match i.e.
  *                                                     no match, but keep searching
- * 
+ *
  * Called when stepping down the array looking for adjacent matches,
  * and from the 2nd set search.
- * 
+ *
  * Is not used for similarity checks.
  */
 static DUPE_CHECK_RESULT dupe_match_check(DupeItem *di1, DupeItem *di2, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
        DupeMatchType mask = dw->match_mask;
 
        if (mask & DUPE_MATCH_ALL)
@@ -1720,11 +1711,11 @@ static DUPE_CHECK_RESULT dupe_match_check(DupeItem *di1, DupeItem *di2, gpointer
 
 /**
  * @brief The callback for the binary search
- * @param a 
- * @param b 
+ * @param a
+ * @param b
  * @param param_match_mask
  * @returns negative/0/positive
- * 
+ *
  * Is not used for similarity checks.
  *
  * Used only when two file sets are used.
@@ -1733,8 +1724,8 @@ static DUPE_CHECK_RESULT dupe_match_check(DupeItem *di1, DupeItem *di2, gpointer
  */
 static gint dupe_match_binary_search_cb(gconstpointer a, gconstpointer b)
 {
-       const DupeItem *di1 = *((DupeItem **) a);
-       const DupeItem *di2 = b;
+       auto di1 = *(static_cast<const DupeItem *const *>(a));
+       auto di2 = static_cast<const DupeItem *>(b);
        DupeMatchType mask = param_match_mask;
 
        if (mask & DUPE_MATCH_ALL)
@@ -1783,18 +1774,18 @@ static gint dupe_match_binary_search_cb(gconstpointer a, gconstpointer b)
 
 /**
  * @brief The callback for the array sort
- * @param a 
- * @param b 
- * @param data 
+ * @param a
+ * @param b
+ * @param data
  * @returns negative/0/positive
- * 
+ *
  * Is not used for similarity checks.
 */
 static gint dupe_match_sort_cb(gconstpointer a, gconstpointer b, gpointer data)
 {
-       const DupeItem *di1 = *((DupeItem **) a);
-       const DupeItem *di2 = *((DupeItem **) b);
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto di1 = *(static_cast<const DupeItem *const *>(a));
+       auto di2 = *(static_cast<const DupeItem *const *>(b));
+       auto dw = static_cast<DupeWindow *>(data);
        DupeMatchType mask = dw->match_mask;
 
        if (mask & DUPE_MATCH_ALL)
@@ -1835,10 +1826,8 @@ static gint dupe_match_sort_cb(gconstpointer a, gconstpointer b, gpointer data)
                    {
                        return -1;
                        }
-               else
-                       {
-                       return strcmp(di1->md5sum, di2->md5sum);
-                       }
+
+               return strcmp(di1->md5sum, di2->md5sum);
                }
        if (mask & DUPE_MATCH_DIM)
                {
@@ -1854,18 +1843,18 @@ static gint dupe_match_sort_cb(gconstpointer a, gconstpointer b, gpointer data)
 
 /**
  * @brief Check for duplicate matches
- * @param dw 
+ * @param dw
  *
  * Is not used for similarity checks.
  *
  * Loads the file sets into an array and sorts on the searched
  * for parameter.
- * 
+ *
  * If one file set, steps down the array looking for adjacent equal values.
- * 
+ *
  * If two file sets, steps down the first set and for each value
  * does a binary search for matches in the second set.
- */ 
+ */
 static void dupe_array_check(DupeWindow *dw )
 {
        GArray *array_set1;
@@ -1887,7 +1876,7 @@ static void dupe_array_check(DupeWindow *dw )
        work = dw->list;
        while (work)
                {
-               DupeItem *di = static_cast<DupeItem *>(work->data);
+               auto di = static_cast<DupeItem *>(work->data);
                g_array_append_val(array_set1, di);
                work = work->next;
                }
@@ -1907,14 +1896,14 @@ static void dupe_array_check(DupeWindow *dw )
                                }
                        g_array_sort_with_data(array_set2, dupe_match_sort_cb, dw);
 
-                       for (i_set1 = 0; i_set1 <= (gint)(array_set1->len) - 1; i_set1++)
+                       for (i_set1 = 0; i_set1 <= static_cast<gint>(array_set1->len) - 1; i_set1++)
                                {
-                               DupeItem *di1 = g_array_index(array_set1, gpointer, i_set1);
-                               DupeItem *di2 = NULL;
+                               auto di1 = static_cast<DupeItem *>(g_array_index(array_set1, gpointer, i_set1));
+                               DupeItem *di2 = nullptr;
                                /* If multiple identical entries in set 1, use the last one */
-                               if (i_set1 < (gint)(array_set1->len) - 2)
+                               if (i_set1 < static_cast<gint>(array_set1->len) - 2)
                                        {
-                                       di2 = g_array_index(array_set1, gpointer, i_set1 + 1);
+                                       di2 = static_cast<DupeItem *>(g_array_index(array_set1, gpointer, i_set1 + 1));
                                        check_result = dupe_match_check(di1, di2, dw);
                                        if (check_result == DUPE_MATCH || check_result == DUPE_NAME_MATCH)
                                                {
@@ -1930,7 +1919,7 @@ static void dupe_array_check(DupeWindow *dw )
                                match_found = FALSE;
                                for(i=0; i < array_set2->len; i++)
                                        {
-                                       di2 = g_array_index(array_set2,  gpointer, i);
+                                       di2 = static_cast<DupeItem *>(g_array_index(array_set2,  gpointer, i));
                                        check_result = dupe_match_check(di1, di2, dw);
                                        if (check_result == DUPE_MATCH)
                                                {
@@ -1943,7 +1932,7 @@ static void dupe_array_check(DupeWindow *dw )
 
                                if (match_found)
                                        {
-                                       di2 = g_array_index(array_set2, gpointer, out_match_index);
+                                       di2 = static_cast<DupeItem *>(g_array_index(array_set2, gpointer, out_match_index));
 
                                        check_result = dupe_match_check(di1, di2, dw);
                                        if (check_result == DUPE_MATCH || check_result == DUPE_NAME_MATCH)
@@ -1954,12 +1943,12 @@ static void dupe_array_check(DupeWindow *dw )
                                                        }
                                                i_set2 = out_match_index + 1;
 
-                                               if (i_set2 > (gint)(array_set2->len) - 1)
+                                               if (i_set2 > static_cast<gint>(array_set2->len) - 1)
                                                        {
                                                        break;
                                                        }
                                                /* Look for multiple matches in set 2 for item di1 */
-                                               di2 = g_array_index(array_set2, gpointer, i_set2);
+                                               di2 = static_cast<DupeItem *>(g_array_index(array_set2, gpointer, i_set2));
                                                check_result = dupe_match_check(di1, di2, dw);
                                                while (check_result == DUPE_MATCH || check_result == DUPE_NAME_MATCH)
                                                        {
@@ -1968,11 +1957,11 @@ static void dupe_array_check(DupeWindow *dw )
                                                                dupe_match_link(di2, di1, 0.0);
                                                                }
                                                        i_set2++;
-                                                       if (i_set2 > (gint)(array_set2->len) - 1)
+                                                       if (i_set2 > static_cast<gint>(array_set2->len) - 1)
                                                                {
                                                                break;
                                                                }
-                                                       di2 = g_array_index(array_set2, gpointer, i_set2);
+                                                       di2 = static_cast<DupeItem *>(g_array_index(array_set2, gpointer, i_set2));
                                                        check_result = dupe_match_check(di1, di2, dw);
                                                        }
                                                }
@@ -1984,14 +1973,14 @@ static void dupe_array_check(DupeWindow *dw )
                {
                /* File set 1 only */
                g_list_free(dw->dupes);
-               dw->dupes = NULL;
+               dw->dupes = nullptr;
 
-               if ((gint)(array_set1->len) > 1)
+               if (static_cast<gint>(array_set1->len) > 1)
                        {
-                       for (i_set1 = 0; i_set1 <= (gint)(array_set1->len) - 2; i_set1++)
+                       for (i_set1 = 0; i_set1 <= static_cast<gint>(array_set1->len) - 2; i_set1++)
                                {
-                               DupeItem *di1 = g_array_index(array_set1, gpointer, i_set1);
-                               DupeItem *di2 = g_array_index(array_set1, gpointer, i_set1 + 1);
+                               auto di1 = static_cast<DupeItem *>(g_array_index(array_set1, gpointer, i_set1));
+                               auto di2 = static_cast<DupeItem *>(g_array_index(array_set1, gpointer, i_set1 + 1));
 
                                check_result = dupe_match_check(di1, di2, dw);
                                if (check_result == DUPE_MATCH || check_result == DUPE_NAME_MATCH)
@@ -2002,12 +1991,12 @@ static void dupe_array_check(DupeWindow *dw )
                                                }
                                        i_set1++;
 
-                                       if ( i_set1 + 1 > (gint)(array_set1->len) - 1)
+                                       if ( i_set1 + 1 > static_cast<gint>(array_set1->len) - 1)
                                                {
                                                break;
                                                }
                                        /* Look for multiple matches for item di1 */
-                                       di2 = g_array_index(array_set1, gpointer, i_set1 + 1);
+                                       di2 = static_cast<DupeItem *>(g_array_index(array_set1, gpointer, i_set1 + 1));
                                        check_result = dupe_match_check(di1, di2, dw);
                                        while (check_result == DUPE_MATCH || check_result == DUPE_NAME_MATCH)
                                                {
@@ -2017,11 +2006,11 @@ static void dupe_array_check(DupeWindow *dw )
                                                        }
                                                i_set1++;
 
-                                               if (i_set1 + 1 > (gint)(array_set1->len) - 1)
+                                               if (i_set1 + 1 > static_cast<gint>(array_set1->len) - 1)
                                                        {
                                                        break;
                                                        }
-                                               di2 = g_array_index(array_set1, gpointer, i_set1 + 1);
+                                               di2 = static_cast<DupeItem *>(g_array_index(array_set1, gpointer, i_set1 + 1));
                                                check_result = dupe_match_check(di1, di2, dw);
                                                }
                                        }
@@ -2034,10 +2023,10 @@ static void dupe_array_check(DupeWindow *dw )
 
 /**
  * @brief Look for similarity match
- * @param dw 
- * @param needle 
- * @param start 
- * 
+ * @param dw
+ * @param needle
+ * @param start
+ *
  * Only used for similarity checks.\n
  * Called from dupe_check_cb.
  * Called for each entry in the list.
@@ -2067,7 +2056,7 @@ static void dupe_list_check_match(DupeWindow *dw, DupeItem *needle, GList *start
        dqi->dw = dw;
        dqi->work = work;
        dqi->index = dw->queue_count;
-       g_thread_pool_push(dw->dupe_comparison_thread_pool, dqi, NULL);
+       g_thread_pool_push(dw->dupe_comparison_thread_pool, dqi, nullptr);
 }
 
 /*
@@ -2103,20 +2092,20 @@ static void dupe_thumb_do(DupeWindow *dw)
        if (di->pixbuf) g_object_unref(di->pixbuf);
        di->pixbuf = thumb_loader_get_pixbuf(dw->thumb_loader);
 
-       dupe_listview_set_thumb(dw, di, NULL);
+       dupe_listview_set_thumb(dw, di, nullptr);
 }
 
-static void dupe_thumb_error_cb(ThumbLoader *UNUSED(tl), gpointer data)
+static void dupe_thumb_error_cb(ThumbLoader *, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
        dupe_thumb_do(dw);
        dupe_thumb_step(dw);
 }
 
-static void dupe_thumb_done_cb(ThumbLoader *UNUSED(tl), gpointer data)
+static void dupe_thumb_done_cb(ThumbLoader *, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
        dupe_thumb_do(dw);
        dupe_thumb_step(dw);
@@ -2126,7 +2115,7 @@ static void dupe_thumb_step(DupeWindow *dw)
 {
        GtkTreeModel *store;
        GtkTreeIter iter;
-       DupeItem *di = NULL;
+       DupeItem *di = nullptr;
        gboolean valid;
        gint row = 0;
        gint length = 0;
@@ -2144,7 +2133,7 @@ static void dupe_thumb_step(DupeWindow *dw)
                        {
                        if (!pixbuf) gtk_list_store_set(GTK_LIST_STORE(store), &iter, DUPE_COLUMN_THUMB, di->pixbuf, -1);
                        row++;
-                       di = NULL;
+                       di = nullptr;
                        }
                valid = gtk_tree_model_iter_next(store, &iter);
                }
@@ -2155,16 +2144,16 @@ static void dupe_thumb_step(DupeWindow *dw)
 
        if (!di)
                {
-               dw->thumb_item = NULL;
+               dw->thumb_item = nullptr;
                thumb_loader_free(dw->thumb_loader);
-               dw->thumb_loader = NULL;
+               dw->thumb_loader = nullptr;
 
-               dupe_window_update_progress(dw, NULL, 0.0, FALSE);
+               dupe_window_update_progress(dw, nullptr, 0.0, FALSE);
                return;
                }
 
        dupe_window_update_progress(dw, _("Loading thumbs..."),
-                                   length == 0 ? 0.0 : (gdouble)(row) / length, FALSE);
+                                   length == 0 ? 0.0 : static_cast<gdouble>(row) / length, FALSE);
 
        dw->thumb_item = di;
        thumb_loader_free(dw->thumb_loader);
@@ -2173,7 +2162,7 @@ static void dupe_thumb_step(DupeWindow *dw)
        thumb_loader_set_callbacks(dw->thumb_loader,
                                   dupe_thumb_done_cb,
                                   dupe_thumb_error_cb,
-                                  NULL,
+                                  nullptr,
                                   dw);
 
        /* start it */
@@ -2204,12 +2193,12 @@ static void dupe_check_stop(DupeWindow *dw)
 
        while (dw->thread_count < dw->queue_count) // Wait for the queue to empty
                {
-               dupe_window_update_progress(dw, NULL, 0.0, FALSE);
+               dupe_window_update_progress(dw, nullptr, 0.0, FALSE);
                widget_set_cursor(dw->listview, -1);
                }
 
        g_list_free(dw->search_matches);
-       dw->search_matches = NULL;
+       dw->search_matches = nullptr;
 
        if (dw->idle_id || dw->img_loader || dw->thumb_loader)
                {
@@ -2218,7 +2207,7 @@ static void dupe_check_stop(DupeWindow *dw)
                        g_source_remove(dw->idle_id);
                        dw->idle_id = 0;
                        }
-               dupe_window_update_progress(dw, NULL, 0.0, FALSE);
+               dupe_window_update_progress(dw, nullptr, 0.0, FALSE);
                widget_set_cursor(dw->listview, -1);
                }
 
@@ -2232,35 +2221,35 @@ static void dupe_check_stop(DupeWindow *dw)
                        {
                        filelist_free(dw->add_files_queue);
                        }
-               dw->add_files_queue = NULL;
-               dupe_window_update_progress(dw, NULL, 0.0, FALSE);
+               dw->add_files_queue = nullptr;
+               dupe_window_update_progress(dw, nullptr, 0.0, FALSE);
                widget_set_cursor(dw->listview, -1);
                }
 
        thumb_loader_free(dw->thumb_loader);
-       dw->thumb_loader = NULL;
+       dw->thumb_loader = nullptr;
 
        image_loader_free(dw->img_loader);
-       dw->img_loader = NULL;
+       dw->img_loader = nullptr;
 }
 
-static void dupe_check_stop_cb(GtkWidget *UNUSED(widget), gpointer data)
+static void dupe_check_stop_cb(GtkWidget *, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
        dupe_check_stop(dw);
 }
 
 static void dupe_loader_done_cb(ImageLoader *il, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
        GdkPixbuf *pixbuf;
 
        pixbuf = image_loader_get_pixbuf(il);
 
        if (dw->setup_point)
                {
-               DupeItem *di = static_cast<DupeItem *>(dw->setup_point->data);
+               auto di = static_cast<DupeItem *>(dw->setup_point->data);
 
                if (!di->simd)
                        {
@@ -2285,14 +2274,14 @@ static void dupe_loader_done_cb(ImageLoader *il, gpointer data)
                }
 
        image_loader_free(dw->img_loader);
-       dw->img_loader = NULL;
+       dw->img_loader = nullptr;
 
        dw->idle_id = g_idle_add(dupe_check_cb, dw);
 }
 
 static void dupe_setup_reset(DupeWindow *dw)
 {
-       dw->setup_point = NULL;
+       dw->setup_point = nullptr;
        dw->setup_n = 0;
        dw->setup_time = msec_time();
        dw->setup_time_count = 0;
@@ -2300,20 +2289,20 @@ static void dupe_setup_reset(DupeWindow *dw)
 
 static GList *dupe_setup_point_step(DupeWindow *dw, GList *p)
 {
-       if (!p) return NULL;
+       if (!p) return nullptr;
 
        if (p->next) return p->next;
 
        if (dw->second_set && g_list_first(p) == dw->list) return dw->second_list;
 
-       return NULL;
+       return nullptr;
 }
 
 /**
  * @brief Generates the sumcheck or dimensions
  * @param list Set1 or set2
  * @returns TRUE/FALSE = not completed/completed
- * 
+ *
  * Ensures that the DIs contain the MD5SUM or dimensions for all items in
  * the list. One item at a time. Re-enters if not completed.
  */
@@ -2328,7 +2317,7 @@ static gboolean create_checksums_dimensions(DupeWindow *dw, GList *list)
 
                        while (dw->setup_point)
                                {
-                               DupeItem *di = static_cast<DupeItem *>(dw->setup_point->data);
+                               auto di = static_cast<DupeItem *>(dw->setup_point->data);
 
                                dw->setup_point = dupe_setup_point_step(dw, dw->setup_point);
                                dw->setup_n++;
@@ -2336,7 +2325,7 @@ static gboolean create_checksums_dimensions(DupeWindow *dw, GList *list)
                                if (!di->md5sum)
                                        {
                                        dupe_window_update_progress(dw, _("Reading checksums..."),
-                                               dw->setup_count == 0 ? 0.0 : (gdouble)(dw->setup_n - 1) / dw->setup_count, FALSE);
+                                               dw->setup_count == 0 ? 0.0 : static_cast<gdouble>(dw->setup_n - 1) / dw->setup_count, FALSE);
 
                                        if (options->thumbnails.enable_caching)
                                                {
@@ -2365,14 +2354,14 @@ static gboolean create_checksums_dimensions(DupeWindow *dw, GList *list)
 
                        while (dw->setup_point)
                                {
-                               DupeItem *di = static_cast<DupeItem *>(dw->setup_point->data);
+                               auto di = static_cast<DupeItem *>(dw->setup_point->data);
 
                                dw->setup_point = dupe_setup_point_step(dw, dw->setup_point);
                                dw->setup_n++;
                                if (di->width == 0 && di->height == 0)
                                        {
                                        dupe_window_update_progress(dw, _("Reading dimensions..."),
-                                               dw->setup_count == 0 ? 0.0 : (gdouble)(dw->setup_n - 1) / dw->setup_count, FALSE);
+                                               dw->setup_count == 0 ? 0.0 : static_cast<gdouble>(dw->setup_n - 1) / dw->setup_count, FALSE);
 
                                        if (options->thumbnails.enable_caching)
                                                {
@@ -2402,21 +2391,21 @@ static gboolean create_checksums_dimensions(DupeWindow *dw, GList *list)
  * @brief Compare func. for sorting search matches
  * @param a #DupeSearchMatch
  * @param b #DupeSearchMatch
- * @returns 
- * 
+ * @returns
+ *
  * Used only for similarity checks\n
  * Sorts search matches on order they were inserted into the pool queue
  */
 static gint sort_func(gconstpointer a, gconstpointer b)
 {
-       return (((DupeSearchMatch *)a)->index - ((DupeSearchMatch *)b)->index);
+       return static_cast<const DupeSearchMatch *>(a)->index - static_cast<const DupeSearchMatch *>(b)->index;
 }
 
 /**
  * @brief Check set 1 (and set 2) for matches
  * @param data DupeWindow
  * @returns TRUE/FALSE = not completed/completed
- * 
+ *
  * Initiated from start, loader done and item remove
  *
  * On first entry generates di->MD5SUM, di->dimensions and sim data,
@@ -2424,12 +2413,13 @@ static gint sort_func(gconstpointer a, gconstpointer b)
  */
 static gboolean dupe_check_cb(gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
        DupeSearchMatch *search_match_list_item;
+       gchar *progress_text;
 
        if (!dw->idle_id)
                {
-               return FALSE;
+               return G_SOURCE_REMOVE;
                }
 
        if (!dw->setup_done) /* Clear on 1st entry */
@@ -2438,14 +2428,14 @@ static gboolean dupe_check_cb(gpointer data)
                        {
                        if (create_checksums_dimensions(dw, dw->list))
                                {
-                               return TRUE;
+                               return G_SOURCE_CONTINUE;
                                }
                        }
                if (dw->second_list)
                        {
                        if (create_checksums_dimensions(dw, dw->second_list))
                                {
-                               return TRUE;
+                               return G_SOURCE_CONTINUE;
                                }
                        }
                if ((dw->match_mask & DUPE_MATCH_SIM_HIGH ||
@@ -2459,12 +2449,12 @@ static gboolean dupe_check_cb(gpointer data)
 
                        while (dw->setup_point)
                                {
-                               DupeItem *di = static_cast<DupeItem *>(dw->setup_point->data);
+                               auto di = static_cast<DupeItem *>(dw->setup_point->data);
 
                                if (!di->simd)
                                        {
                                        dupe_window_update_progress(dw, _("Reading similarity data..."),
-                                               dw->setup_count == 0 ? 0.0 : (gdouble)dw->setup_n / dw->setup_count, FALSE);
+                                               dw->setup_count == 0 ? 0.0 : static_cast<gdouble>(dw->setup_n) / dw->setup_count, FALSE);
 
                                        if (options->thumbnails.enable_caching)
                                                {
@@ -2472,7 +2462,7 @@ static gboolean dupe_check_cb(gpointer data)
                                                if (cache_sim_data_filled(di->simd))
                                                        {
                                                        image_sim_alternate_processing(di->simd);
-                                                       return TRUE;
+                                                       return G_SOURCE_CONTINUE;
                                                        }
                                                }
 
@@ -2486,17 +2476,17 @@ static gboolean dupe_check_cb(gpointer data)
                                                image_sim_free(di->simd);
                                                di->simd = image_sim_new();
                                                image_loader_free(dw->img_loader);
-                                               dw->img_loader = NULL;
-                                               return TRUE;
+                                               dw->img_loader = nullptr;
+                                               return G_SOURCE_CONTINUE;
                                                }
                                        dw->idle_id = 0;
-                                       return FALSE;
+                                       return G_SOURCE_REMOVE;
                                        }
 
                                dw->setup_point = dupe_setup_point_step(dw, dw->setup_point);
                                dw->setup_n++;
                                }
-                       dw->setup_mask |= DUPE_MATCH_SIM_MED;
+                       dw->setup_mask = static_cast<DupeMatchType>(dw->setup_mask | DUPE_MATCH_SIM_MED);
                        dupe_setup_reset(dw);
                        }
 
@@ -2521,12 +2511,16 @@ static gboolean dupe_check_cb(gpointer data)
                        {
                        if( dw->thread_count < dw->queue_count)
                                {
-                               dupe_window_update_progress(dw, _("Comparing..."), 0.0, FALSE);
+                               progress_text = g_strdup_printf("%s %d%s%d", _("Comparing"), dw->thread_count, "/", dw->queue_count);
 
-                               return TRUE;
+                               dupe_window_update_progress(dw, progress_text, (gdouble)dw->thread_count / dw->queue_count, TRUE);
+
+                               g_free(progress_text);
+
+                               return G_SOURCE_CONTINUE;
                                }
 
-                       if (dw->search_matches_sorted == NULL)
+                       if (dw->search_matches_sorted == nullptr)
                                {
                                dw->search_matches_sorted = g_list_sort(dw->search_matches, sort_func);
                                dupe_setup_reset(dw);
@@ -2545,15 +2539,15 @@ static gboolean dupe_check_cb(gpointer data)
 
                                dw->search_matches_sorted = dw->search_matches_sorted->next;
 
-                               if (dw->search_matches_sorted != NULL)
+                               if (dw->search_matches_sorted != nullptr)
                                        {
-                                       return TRUE;
+                                       return G_SOURCE_CONTINUE;
                                        }
                                }
                        g_list_free(dw->search_matches);
-                       dw->search_matches = NULL;
+                       dw->search_matches = nullptr;
                        g_list_free(dw->search_matches_sorted);
-                       dw->search_matches_sorted = NULL;
+                       dw->search_matches_sorted = nullptr;
                        dw->setup_count = 0;
                        }
                else
@@ -2562,12 +2556,12 @@ static gboolean dupe_check_cb(gpointer data)
                                {
                                dw->setup_count = 0;
                                dupe_window_update_progress(dw, _("Sorting..."), 1.0, TRUE);
-                               return TRUE;
+                               return G_SOURCE_CONTINUE;
                                }
                        }
 
                dw->idle_id = 0;
-               dupe_window_update_progress(dw, NULL, 0.0, FALSE);
+               dupe_window_update_progress(dw, nullptr, 0.0, FALSE);
 
                dupe_match_rank(dw);
                dupe_window_update_count(dw, FALSE);
@@ -2579,7 +2573,7 @@ static gboolean dupe_check_cb(gpointer data)
 
                widget_set_cursor(dw->listview, -1);
 
-               return FALSE;
+               return G_SOURCE_REMOVE;
                /* The end */
                }
 
@@ -2590,8 +2584,8 @@ static gboolean dupe_check_cb(gpointer data)
                dw->match_mask == DUPE_MATCH_SIM_CUSTOM)
                {
                /* This is the similarity comparison */
-               dupe_list_check_match(dw, (DupeItem *)dw->working->data, dw->working);
-               dupe_window_update_progress(dw, _("Queuing..."), dw->setup_count == 0 ? 0.0 : (gdouble) dw->setup_n / dw->setup_count, FALSE);
+               dupe_list_check_match(dw, static_cast<DupeItem *>(dw->working->data), dw->working);
+               dupe_window_update_progress(dw, _("Queuing..."), dw->setup_count == 0 ? 0.0 : static_cast<gdouble>(dw->setup_n) / dw->setup_count, FALSE);
                dw->setup_n++;
                dw->queue_count++;
 
@@ -2602,12 +2596,12 @@ static gboolean dupe_check_cb(gpointer data)
                /* This is the comparison for all other parameters.
                 * dupe_array_check() processes the entire list in one go
                */
-               dw->working = NULL;
+               dw->working = nullptr;
                dupe_window_update_progress(dw, _("Comparing..."), 0.0, FALSE);
                dupe_array_check(dw);
                }
 
-       return TRUE;
+       return G_SOURCE_CONTINUE;
 }
 
 static void dupe_check_start(DupeWindow *dw)
@@ -2617,7 +2611,7 @@ static void dupe_check_start(DupeWindow *dw)
        dw->setup_count = g_list_length(dw->list);
        if (dw->second_set) dw->setup_count += g_list_length(dw->second_list);
 
-       dw->setup_mask = 0;
+       dw->setup_mask = DUPE_MATCH_NONE;
        dupe_setup_reset(dw);
 
        dw->working = g_list_last(dw->list);
@@ -2626,7 +2620,7 @@ static void dupe_check_start(DupeWindow *dw)
        widget_set_cursor(dw->listview, GDK_WATCH);
        dw->queue_count = 0;
        dw->thread_count = 0;
-       dw->search_matches_sorted = NULL;
+       dw->search_matches_sorted = nullptr;
        dw->abort = FALSE;
 
        if (dw->idle_id) return;
@@ -2636,7 +2630,7 @@ static void dupe_check_start(DupeWindow *dw)
 
 static gboolean dupe_check_start_cb(gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
        dupe_check_start(dw);
 
@@ -2668,7 +2662,7 @@ static void dupe_item_remove(DupeWindow *dw, DupeItem *di)
                if (dw->img_loader)
                        {
                        image_loader_free(dw->img_loader);
-                       dw->img_loader = NULL;
+                       dw->img_loader = nullptr;
                        dw->idle_id = g_idle_add(dupe_check_cb, dw);
                        }
                }
@@ -2735,30 +2729,31 @@ static void dupe_item_remove(DupeWindow *dw, DupeItem *di)
        dupe_window_update_count(dw, FALSE);
 }
 
-/*
-static gboolean dupe_item_remove_by_path(DupeWindow *dw, const gchar *path)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-function"
+static gboolean dupe_item_remove_by_path_unused(DupeWindow *dw, const gchar *path)
 {
        DupeItem *di;
 
-       di = dupe_item_find_path(dw, path);
+       di = dupe_item_find_path_unused(dw, path);
        if (!di) return FALSE;
 
        dupe_item_remove(dw, di);
 
        return TRUE;
 }
-*/
+#pragma GCC diagnostic pop
 
 static gboolean dupe_files_add_queue_cb(gpointer data)
 {
-       DupeItem *di = NULL;
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       DupeItem *di = nullptr;
+       auto dw = static_cast<DupeWindow *>(data);
        FileData *fd;
        GList *queue = dw->add_files_queue;
 
        gtk_progress_bar_pulse(GTK_PROGRESS_BAR(dw->extra_label));
 
-       if (queue == NULL)
+       if (queue == nullptr)
                {
                dw->add_files_queue_id = 0;
                dupe_destroy_list_cache(dw);
@@ -2776,7 +2771,8 @@ static gboolean dupe_files_add_queue_cb(gpointer data)
                        }
                else if (isdir(fd->path))
                        {
-                       GList *f, *d;
+                       GList *f;
+                       GList *d;
                        dw->add_files_queue = g_list_remove(dw->add_files_queue, g_list_first(dw->add_files_queue)->data);
 
                        if (filelist_read(fd, &f, &d))
@@ -2821,24 +2817,22 @@ static gboolean dupe_files_add_queue_cb(gpointer data)
                dw->list = g_list_prepend(dw->list, di);
                }
 
-       if (dw->add_files_queue != NULL)
+       if (dw->add_files_queue != nullptr)
                {
                return TRUE;
                }
-       else
-               {
-               dw->add_files_queue_id = 0;
-               dupe_destroy_list_cache(dw);
-               g_idle_add(dupe_check_start_cb, dw);
-               gtk_widget_set_sensitive(dw->controls_box, TRUE);
-               return FALSE;
-               }
+
+       dw->add_files_queue_id = 0;
+       dupe_destroy_list_cache(dw);
+       g_idle_add(dupe_check_start_cb, dw);
+       gtk_widget_set_sensitive(dw->controls_box, TRUE);
+       return FALSE;
 }
 
-static void dupe_files_add(DupeWindow *dw, CollectionData *UNUSED(collection), CollectInfo *info,
+static void dupe_files_add(DupeWindow *dw, CollectionData *, CollectInfo *info,
                           FileData *fd, gboolean recurse)
 {
-       DupeItem *di = NULL;
+       DupeItem *di = nullptr;
 
        if (info)
                {
@@ -2852,7 +2846,8 @@ static void dupe_files_add(DupeWindow *dw, CollectionData *UNUSED(collection), C
                        }
                else if (isdir(fd->path) && recurse)
                        {
-                       GList *f, *d;
+                       GList *f;
+                       GList *d;
                        if (filelist_read(fd, &f, &d))
                                {
                                GList *work;
@@ -2863,14 +2858,14 @@ static void dupe_files_add(DupeWindow *dw, CollectionData *UNUSED(collection), C
                                work = f;
                                while (work)
                                        {
-                                       dupe_files_add(dw, NULL, NULL, (FileData *)work->data, TRUE);
+                                       dupe_files_add(dw, nullptr, nullptr, static_cast<FileData *>(work->data), TRUE);
                                        work = work->next;
                                        }
                                filelist_free(f);
                                work = d;
                                while (work)
                                        {
-                                       dupe_files_add(dw, NULL, NULL, (FileData *)work->data, TRUE);
+                                       dupe_files_add(dw, nullptr, nullptr, static_cast<FileData *>(work->data), TRUE);
                                        work = work->next;
                                        }
                                filelist_free(d);
@@ -2893,10 +2888,8 @@ static void dupe_files_add(DupeWindow *dw, CollectionData *UNUSED(collection), C
                        {
                        return;
                        }
-               else
-                       {
-                       work = work->next;
-                       }
+
+               work = work->next;
                }
 
        if (dw->second_list)
@@ -2909,10 +2902,8 @@ static void dupe_files_add(DupeWindow *dw, CollectionData *UNUSED(collection), C
                                {
                                return;
                                }
-                       else
-                               {
-                               work = work->next;
-                               }
+
+                       work = work->next;
                        }
                }
 
@@ -2931,16 +2922,16 @@ static void dupe_init_list_cache(DupeWindow *dw)
        dw->list_cache = g_hash_table_new(g_direct_hash, g_direct_equal);
        dw->second_list_cache = g_hash_table_new(g_direct_hash, g_direct_equal);
 
-       for (GList *i = dw->list; i != NULL; i = i->next)
+       for (GList *i = dw->list; i != nullptr; i = i->next)
                {
-                       DupeItem *di = static_cast<DupeItem *>(i->data);
+                       auto di = static_cast<DupeItem *>(i->data);
 
                        g_hash_table_add(dw->list_cache, di->fd);
                }
 
-       for (GList *i = dw->second_list; i != NULL; i = i->next)
+       for (GList *i = dw->second_list; i != nullptr; i = i->next)
                {
-                       DupeItem *di = static_cast<DupeItem *>(i->data);
+                       auto di = static_cast<DupeItem *>(i->data);
 
                        g_hash_table_add(dw->second_list_cache, di->fd);
                }
@@ -2954,11 +2945,11 @@ static void dupe_destroy_list_cache(DupeWindow *dw)
 
 /**
  * @brief Return true if the fd was not in the cache
- * @param dw 
- * @param fd 
- * @returns 
- * 
- * 
+ * @param dw
+ * @param fd
+ * @returns
+ *
+ *
  */
 static gboolean dupe_insert_in_list_cache(DupeWindow *dw, FileData *fd)
 {
@@ -2966,7 +2957,7 @@ static gboolean dupe_insert_in_list_cache(DupeWindow *dw, FileData *fd)
                dw->second_drop ? dw->second_list_cache : dw->list_cache;
        /* We do this as a lookup + add as we don't want to overwrite
           items as that would leak the old value. */
-       if (g_hash_table_lookup(table, fd) != NULL)
+       if (g_hash_table_lookup(table, fd) != nullptr)
                return FALSE;
        return g_hash_table_add(table, fd);
 }
@@ -2978,7 +2969,7 @@ void dupe_window_add_collection(DupeWindow *dw, CollectionData *collection)
        info = collection_get_first(collection);
        while (info)
                {
-               dupe_files_add(dw, collection, info, NULL, FALSE);
+               dupe_files_add(dw, collection, info, nullptr, FALSE);
                info = collection_next_by_info(collection, info);
                }
 
@@ -2992,11 +2983,12 @@ void dupe_window_add_files(DupeWindow *dw, GList *list, gboolean recurse)
        work = list;
        while (work)
                {
-               FileData *fd = static_cast<FileData *>(work->data);
+               auto fd = static_cast<FileData *>(work->data);
                work = work->next;
                if (isdir(fd->path) && !recurse)
                        {
-                       GList *f, *d;
+                       GList *f;
+                       GList *d;
 
                        if (filelist_read(fd, &f, &d))
                                {
@@ -3085,7 +3077,7 @@ static void dupe_item_update_fd_in_list(DupeWindow *dw, FileData *fd, GList *wor
 {
        while (work)
                {
-               DupeItem *di = static_cast<DupeItem *>(work->data);
+               auto di = static_cast<DupeItem *>(work->data);
 
                if (di->fd == fd)
                        dupe_item_update(dw, di);
@@ -3115,14 +3107,14 @@ static GtkWidget *dupe_display_label(GtkWidget *vbox, const gchar *description,
        hbox = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 10);
 
        label = gtk_label_new(description);
-       gtk_box_pack_start(GTK_BOX(hbox), label, FALSE, FALSE, 0);
+       gq_gtk_box_pack_start(GTK_BOX(hbox), label, FALSE, FALSE, 0);
        gtk_widget_show(label);
 
        label = gtk_label_new(text);
-       gtk_box_pack_start(GTK_BOX(hbox), label, FALSE, FALSE, 0);
+       gq_gtk_box_pack_start(GTK_BOX(hbox), label, FALSE, FALSE, 0);
        gtk_widget_show(label);
 
-       gtk_box_pack_start(GTK_BOX(vbox), hbox, FALSE, FALSE, 0);
+       gq_gtk_box_pack_start(GTK_BOX(vbox), hbox, FALSE, FALSE, 0);
        gtk_widget_show(hbox);
 
        return label;
@@ -3135,10 +3127,10 @@ static void dupe_display_stats(DupeWindow *dw, DupeItem *di)
 
        if (!di) return;
 
-       gd = file_util_gen_dlg("Image thumbprint debug info", "thumbprint",
+       gd = file_util_gen_dlg(_("Image thumbprint debug info"), "thumbprint",
                               dw->window, TRUE,
-                              NULL, NULL);
-       generic_dialog_add_button(gd, GTK_STOCK_CLOSE, NULL, NULL, TRUE);
+                              nullptr, nullptr);
+       generic_dialog_add_button(gd, GQ_ICON_CLOSE, _("Close"), nullptr, TRUE);
 
        dupe_display_label(gd->vbox, "name:", di->fd->name);
        buf = text_from_size(di->fd->size);
@@ -3155,7 +3147,8 @@ static void dupe_display_stats(DupeWindow *dw, DupeItem *di)
                {
                GtkWidget *image;
                GdkPixbuf *pixbuf;
-               gint x, y;
+               gint x;
+               gint y;
                guchar *d_pix;
                guchar *dp;
                gint rs;
@@ -3178,7 +3171,7 @@ static void dupe_display_stats(DupeWindow *dw, DupeItem *di)
                        }
 
                image = gtk_image_new_from_pixbuf(pixbuf);
-               gtk_box_pack_start(GTK_BOX(gd->vbox), image, FALSE, FALSE, 0);
+               gq_gtk_box_pack_start(GTK_BOX(gd->vbox), image, FALSE, FALSE, 0);
                gtk_widget_show(image);
 
                g_object_unref(pixbuf);
@@ -3197,7 +3190,7 @@ static void dupe_window_recompare(DupeWindow *dw)
        gtk_list_store_clear(store);
 
        g_list_free(dw->dupes);
-       dw->dupes = NULL;
+       dw->dupes = nullptr;
 
        dupe_match_reset_list(dw->list);
        dupe_match_reset_list(dw->second_list);
@@ -3218,7 +3211,7 @@ static void dupe_menu_view(DupeWindow *dw, DupeItem *di, GtkWidget *listview, gi
                        }
                else
                        {
-                       layout_image_set_collection(NULL, di->collection, di->info);
+                       layout_image_set_collection(nullptr, di->collection, di->info);
                        }
                }
        else
@@ -3233,7 +3226,7 @@ static void dupe_menu_view(DupeWindow *dw, DupeItem *di, GtkWidget *listview, gi
                        }
                else
                        {
-                       layout_set_fd(NULL, di->fd);
+                       layout_set_fd(nullptr, di->fd);
                        }
                }
 }
@@ -3244,7 +3237,7 @@ static void dupe_window_remove_selection(DupeWindow *dw, GtkWidget *listview)
        GtkTreeModel *store;
        GtkTreeIter iter;
        GList *slist;
-       GList *list = NULL;
+       GList *list = nullptr;
        GList *work;
 
        selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(listview));
@@ -3252,16 +3245,15 @@ static void dupe_window_remove_selection(DupeWindow *dw, GtkWidget *listview)
        work = slist;
        while (work)
                {
-               GtkTreePath *tpath = static_cast<GtkTreePath *>(work->data);
-               DupeItem *di = NULL;
+               auto tpath = static_cast<GtkTreePath *>(work->data);
+               DupeItem *di = nullptr;
 
                gtk_tree_model_get_iter(store, &iter, tpath);
                gtk_tree_model_get(store, &iter, DUPE_COLUMN_POINTER, &di, -1);
                if (di) list = g_list_prepend(list, di);
                work = work->next;
                }
-       g_list_foreach(slist, (GFunc)tree_path_free_wrapper, NULL);
-       g_list_free(slist);
+       g_list_free_full(slist, reinterpret_cast<GDestroyNotify>(gtk_tree_path_free));
 
        dw->color_frozen = TRUE;
        work = list;
@@ -3282,7 +3274,7 @@ static void dupe_window_remove_selection(DupeWindow *dw, GtkWidget *listview)
 
 static void dupe_window_edit_selected(DupeWindow *dw, const gchar *key)
 {
-       file_util_start_editor_from_filelist(key, dupe_listview_get_selection(dw, dw->listview), NULL, dw->window);
+       file_util_start_editor_from_filelist(key, dupe_listview_get_selection(dw, dw->listview), nullptr, dw->window);
 }
 
 static void dupe_window_collection_from_selection(DupeWindow *dw)
@@ -3291,7 +3283,7 @@ static void dupe_window_collection_from_selection(DupeWindow *dw)
        GList *list;
 
        list = dupe_listview_get_selection(dw, dw->listview);
-       w = collection_window_new(NULL);
+       w = collection_window_new(nullptr);
        collection_table_add_filelist(w->table, list);
        filelist_free(list);
 }
@@ -3302,7 +3294,7 @@ static void dupe_window_append_file_list(DupeWindow *dw, gint on_second)
 
        dw->second_drop = (dw->second_set && on_second);
 
-       list = layout_list(NULL);
+       list = layout_list(nullptr);
        dupe_window_add_files(dw, list, FALSE);
        filelist_free(list);
 }
@@ -3313,23 +3305,23 @@ static void dupe_window_append_file_list(DupeWindow *dw, gint on_second)
  *-------------------------------------------------------------------
  */
 
-static void dupe_menu_view_cb(GtkWidget *UNUSED(widget), gpointer data)
+static void dupe_menu_view_cb(GtkWidget *, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
        if (dw->click_item) dupe_menu_view(dw, dw->click_item, dw->listview, FALSE);
 }
 
-static void dupe_menu_viewnew_cb(GtkWidget *UNUSED(widget), gpointer data)
+static void dupe_menu_viewnew_cb(GtkWidget *, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
        if (dw->click_item) dupe_menu_view(dw, dw->click_item, dw->listview, TRUE);
 }
 
-static void dupe_menu_select_all_cb(GtkWidget *UNUSED(widget), gpointer data)
+static void dupe_menu_select_all_cb(GtkWidget *, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
        GtkTreeSelection *selection;
 
        options->duplicates_select_type = DUPE_SELECT_NONE;
@@ -3337,9 +3329,9 @@ static void dupe_menu_select_all_cb(GtkWidget *UNUSED(widget), gpointer data)
        gtk_tree_selection_select_all(selection);
 }
 
-static void dupe_menu_select_none_cb(GtkWidget *UNUSED(widget), gpointer data)
+static void dupe_menu_select_none_cb(GtkWidget *, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
        GtkTreeSelection *selection;
 
        options->duplicates_select_type = DUPE_SELECT_NONE;
@@ -3347,17 +3339,17 @@ static void dupe_menu_select_none_cb(GtkWidget *UNUSED(widget), gpointer data)
        gtk_tree_selection_unselect_all(selection);
 }
 
-static void dupe_menu_select_dupes_set1_cb(GtkWidget *UNUSED(widget), gpointer data)
+static void dupe_menu_select_dupes_set1_cb(GtkWidget *, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
        options->duplicates_select_type = DUPE_SELECT_GROUP1;
        dupe_listview_select_dupes(dw, DUPE_SELECT_GROUP1);
 }
 
-static void dupe_menu_select_dupes_set2_cb(GtkWidget *UNUSED(widget), gpointer data)
+static void dupe_menu_select_dupes_set2_cb(GtkWidget *, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
        options->duplicates_select_type = DUPE_SELECT_GROUP2;
        dupe_listview_select_dupes(dw, DUPE_SELECT_GROUP2);
@@ -3366,7 +3358,7 @@ static void dupe_menu_select_dupes_set2_cb(GtkWidget *UNUSED(widget), gpointer d
 static void dupe_menu_edit_cb(GtkWidget *widget, gpointer data)
 {
        DupeWindow *dw;
-       const gchar *key = static_cast<const gchar *>(data);
+       auto key = static_cast<const gchar *>(data);
 
        dw = static_cast<DupeWindow *>(submenu_item_get_data(widget));
        if (!dw) return;
@@ -3374,93 +3366,93 @@ static void dupe_menu_edit_cb(GtkWidget *widget, gpointer data)
        dupe_window_edit_selected(dw, key);
 }
 
-static void dupe_menu_print_cb(GtkWidget *UNUSED(widget), gpointer data)
+static void dupe_menu_print_cb(GtkWidget *, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
        FileData *fd;
 
-       fd = (dw->click_item) ? dw->click_item->fd : NULL;
+       fd = (dw->click_item) ? dw->click_item->fd : nullptr;
 
        print_window_new(fd,
                         dupe_listview_get_selection(dw, dw->listview),
                         dupe_listview_get_filelist(dw, dw->listview), dw->window);
 }
 
-static void dupe_menu_copy_cb(GtkWidget *UNUSED(widget), gpointer data)
+static void dupe_menu_copy_cb(GtkWidget *, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
-       file_util_copy(NULL, dupe_listview_get_selection(dw, dw->listview), NULL, dw->window);
+       file_util_copy(nullptr, dupe_listview_get_selection(dw, dw->listview), nullptr, dw->window);
 }
 
-static void dupe_menu_move_cb(GtkWidget *UNUSED(widget), gpointer data)
+static void dupe_menu_move_cb(GtkWidget *, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
-       file_util_move(NULL, dupe_listview_get_selection(dw, dw->listview), NULL, dw->window);
+       file_util_move(nullptr, dupe_listview_get_selection(dw, dw->listview), nullptr, dw->window);
 }
 
-static void dupe_menu_rename_cb(GtkWidget *UNUSED(widget), gpointer data)
+static void dupe_menu_rename_cb(GtkWidget *, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
-       file_util_rename(NULL, dupe_listview_get_selection(dw, dw->listview), dw->window);
+       file_util_rename(nullptr, dupe_listview_get_selection(dw, dw->listview), dw->window);
 }
 
-static void dupe_menu_delete_cb(GtkWidget *UNUSED(widget), gpointer data)
+static void dupe_menu_delete_cb(GtkWidget *, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
        options->file_ops.safe_delete_enable = FALSE;
-       file_util_delete_notify_done(NULL, dupe_listview_get_selection(dw, dw->listview), dw->window, delete_finished_cb, dw);
+       file_util_delete_notify_done(nullptr, dupe_listview_get_selection(dw, dw->listview), dw->window, delete_finished_cb, dw);
 }
 
-static void dupe_menu_move_to_trash_cb(GtkWidget *UNUSED(widget), gpointer data)
+static void dupe_menu_move_to_trash_cb(GtkWidget *, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
        options->file_ops.safe_delete_enable = TRUE;
-       file_util_delete_notify_done(NULL, dupe_listview_get_selection(dw, dw->listview), dw->window, delete_finished_cb, dw);
+       file_util_delete_notify_done(nullptr, dupe_listview_get_selection(dw, dw->listview), dw->window, delete_finished_cb, dw);
 }
 
-static void dupe_menu_copy_path_cb(GtkWidget *UNUSED(widget), gpointer data)
+static void dupe_menu_copy_path_cb(GtkWidget *, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
        file_util_copy_path_list_to_clipboard(dupe_listview_get_selection(dw, dw->listview), TRUE);
 }
 
-static void dupe_menu_copy_path_unquoted_cb(GtkWidget *UNUSED(widget), gpointer data)
+static void dupe_menu_copy_path_unquoted_cb(GtkWidget *, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
        file_util_copy_path_list_to_clipboard(dupe_listview_get_selection(dw, dw->listview), FALSE);
 }
 
-static void dupe_menu_remove_cb(GtkWidget *UNUSED(widget), gpointer data)
+static void dupe_menu_remove_cb(GtkWidget *, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
        dupe_window_remove_selection(dw, dw->listview);
 }
 
-static void dupe_menu_clear_cb(GtkWidget *UNUSED(widget), gpointer data)
+static void dupe_menu_clear_cb(GtkWidget *, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
        dupe_window_clear(dw);
 }
 
-static void dupe_menu_close_cb(GtkWidget *UNUSED(widget), gpointer data)
+static void dupe_menu_close_cb(GtkWidget *, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
        dupe_window_close(dw);
 }
 
-static void dupe_menu_popup_destroy_cb(GtkWidget *UNUSED(widget), gpointer data)
+static void dupe_menu_popup_destroy_cb(GtkWidget *, gpointer data)
 {
-       GList *editmenu_fd_list = static_cast<GList *>(data);
+       auto editmenu_fd_list = static_cast<GList *>(data);
 
        filelist_free(editmenu_fd_list);
 }
@@ -3483,10 +3475,10 @@ static GList *dupe_window_get_fd_list(DupeWindow *dw)
 
 /**
  * @brief Add file selection list to a collection
- * @param[in] widget 
+ * @param[in] widget
  * @param[in] data Index to the collection list menu item selected, or -1 for new collection
- * 
- * 
+ *
+ *
  */
 static void dupe_pop_menu_collections_cb(GtkWidget *widget, gpointer data)
 {
@@ -3508,7 +3500,7 @@ static GtkWidget *dupe_menu_popup_main(DupeWindow *dw, DupeItem *di)
        GList *editmenu_fd_list;
        GtkAccelGroup *accel_group;
 
-       on_row = (di != NULL);
+       on_row = (di != nullptr);
 
        menu = popup_menu_short_lived();
 
@@ -3520,16 +3512,16 @@ static GtkWidget *dupe_menu_popup_main(DupeWindow *dw, DupeItem *di)
 
        menu_item_add_sensitive(menu, _("_View"), on_row,
                                G_CALLBACK(dupe_menu_view_cb), dw);
-       menu_item_add_stock_sensitive(menu, _("View in _new window"), GTK_STOCK_NEW, on_row,
+       menu_item_add_icon_sensitive(menu, _("View in _new window"), GQ_ICON_NEW, on_row,
                                G_CALLBACK(dupe_menu_viewnew_cb), dw);
        menu_item_add_divider(menu);
-       menu_item_add_sensitive(menu, _("Select all"), (dw->dupes != NULL),
+       menu_item_add_sensitive(menu, _("Select all"), (dw->dupes != nullptr),
                                G_CALLBACK(dupe_menu_select_all_cb), dw);
-       menu_item_add_sensitive(menu, _("Select none"), (dw->dupes != NULL),
+       menu_item_add_sensitive(menu, _("Select none"), (dw->dupes != nullptr),
                                G_CALLBACK(dupe_menu_select_none_cb), dw);
-       menu_item_add_sensitive(menu, _("Select group _1 duplicates"), (dw->dupes != NULL),
+       menu_item_add_sensitive(menu, _("Select group _1 duplicates"), (dw->dupes != nullptr),
                                G_CALLBACK(dupe_menu_select_dupes_set1_cb), dw);
-       menu_item_add_sensitive(menu, _("Select group _2 duplicates"), (dw->dupes != NULL),
+       menu_item_add_sensitive(menu, _("Select group _2 duplicates"), (dw->dupes != nullptr),
                                G_CALLBACK(dupe_menu_select_dupes_set2_cb), dw);
        menu_item_add_divider(menu);
 
@@ -3547,10 +3539,10 @@ static GtkWidget *dupe_menu_popup_main(DupeWindow *dw, DupeItem *di)
                                                                G_CALLBACK(dupe_pop_menu_collections_cb), dw);
        gtk_widget_set_sensitive(item, on_row);
 
-       menu_item_add_stock_sensitive(menu, _("Print..."), GTK_STOCK_PRINT, on_row,
+       menu_item_add_icon_sensitive(menu, _("Print..."), GQ_ICON_PRINT, on_row,
                                G_CALLBACK(dupe_menu_print_cb), dw);
        menu_item_add_divider(menu);
-       menu_item_add_stock_sensitive(menu, _("_Copy..."), GTK_STOCK_COPY, on_row,
+       menu_item_add_icon_sensitive(menu, _("_Copy..."), GQ_ICON_COPY, on_row,
                                G_CALLBACK(dupe_menu_copy_cb), dw);
        menu_item_add_sensitive(menu, _("_Move..."), on_row,
                                G_CALLBACK(dupe_menu_move_cb), dw);
@@ -3562,22 +3554,22 @@ static GtkWidget *dupe_menu_popup_main(DupeWindow *dw, DupeItem *di)
                                G_CALLBACK(dupe_menu_copy_path_unquoted_cb), dw);
 
        menu_item_add_divider(menu);
-       menu_item_add_stock_sensitive(menu,
+       menu_item_add_icon_sensitive(menu,
                                options->file_ops.confirm_move_to_trash ? _("Move to Trash...") :
-                                       _("Move to Trash"), PIXBUF_INLINE_ICON_TRASH, on_row,
+                                       _("Move to Trash"), GQ_ICON_DELETE, on_row,
                                G_CALLBACK(dupe_menu_move_to_trash_cb), dw);
-       menu_item_add_stock_sensitive(menu,
+       menu_item_add_icon_sensitive(menu,
                                options->file_ops.confirm_delete ? _("_Delete...") :
-                                       _("_Delete"), GTK_STOCK_DELETE, on_row,
+                                       _("_Delete"), GQ_ICON_DELETE_SHRED, on_row,
                                G_CALLBACK(dupe_menu_delete_cb), dw);
 
        menu_item_add_divider(menu);
-       menu_item_add_stock_sensitive(menu, _("Rem_ove"), GTK_STOCK_REMOVE, on_row,
+       menu_item_add_icon_sensitive(menu, _("Rem_ove"), GQ_ICON_REMOVE, on_row,
                                G_CALLBACK(dupe_menu_remove_cb), dw);
-       menu_item_add_stock_sensitive(menu, _("C_lear"), GTK_STOCK_CLEAR, (dw->list != NULL),
+       menu_item_add_icon_sensitive(menu, _("C_lear"), GQ_ICON_CLEAR, (dw->list != nullptr),
                                G_CALLBACK(dupe_menu_clear_cb), dw);
        menu_item_add_divider(menu);
-       menu_item_add_stock(menu, _("Close _window"), GTK_STOCK_CLOSE,
+       menu_item_add_icon(menu, _("Close _window"), GQ_ICON_CLOSE,
                            G_CALLBACK(dupe_menu_close_cb), dw);
 
        return menu;
@@ -3585,16 +3577,16 @@ static GtkWidget *dupe_menu_popup_main(DupeWindow *dw, DupeItem *di)
 
 static gboolean dupe_listview_press_cb(GtkWidget *widget, GdkEventButton *bevent, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
        GtkTreeModel *store;
        GtkTreePath *tpath;
        GtkTreeIter iter;
-       DupeItem *di = NULL;
+       DupeItem *di = nullptr;
 
        store = gtk_tree_view_get_model(GTK_TREE_VIEW(widget));
 
        if (gtk_tree_view_get_path_at_pos(GTK_TREE_VIEW(widget), bevent->x, bevent->y,
-                                         &tpath, NULL, NULL, NULL))
+                                         &tpath, nullptr, nullptr, nullptr))
                {
                gtk_tree_model_get_iter(store, &iter, tpath);
                gtk_tree_model_get(store, &iter, DUPE_COLUMN_POINTER, &di, -1);
@@ -3621,7 +3613,7 @@ static gboolean dupe_listview_press_cb(GtkWidget *widget, GdkEventButton *bevent
                        {
                        menu = dupe_menu_popup_second(dw, di);
                        }
-               gtk_menu_popup_at_pointer(GTK_MENU(menu), NULL);
+               gtk_menu_popup_at_pointer(GTK_MENU(menu), nullptr);
                }
 
        if (!di) return FALSE;
@@ -3645,7 +3637,7 @@ static gboolean dupe_listview_press_cb(GtkWidget *widget, GdkEventButton *bevent
                        gtk_tree_selection_select_iter(selection, &iter);
 
                        tpath = gtk_tree_model_get_path(GTK_TREE_MODEL(store), &iter);
-                       gtk_tree_view_set_cursor(GTK_TREE_VIEW(widget), tpath, NULL, FALSE);
+                       gtk_tree_view_set_cursor(GTK_TREE_VIEW(widget), tpath, nullptr, FALSE);
                        gtk_tree_path_free(tpath);
                        }
 
@@ -3668,11 +3660,11 @@ static gboolean dupe_listview_press_cb(GtkWidget *widget, GdkEventButton *bevent
 
 static gboolean dupe_listview_release_cb(GtkWidget *widget, GdkEventButton *bevent, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
        GtkTreeModel *store;
        GtkTreePath *tpath;
        GtkTreeIter iter;
-       DupeItem *di = NULL;
+       DupeItem *di = nullptr;
 
        if (bevent->button != MOUSE_BUTTON_LEFT && bevent->button != MOUSE_BUTTON_MIDDLE) return TRUE;
 
@@ -3680,7 +3672,7 @@ static gboolean dupe_listview_release_cb(GtkWidget *widget, GdkEventButton *beve
 
        if ((bevent->x != 0 || bevent->y != 0) &&
            gtk_tree_view_get_path_at_pos(GTK_TREE_VIEW(widget), bevent->x, bevent->y,
-                                         &tpath, NULL, NULL, NULL))
+                                         &tpath, nullptr, nullptr, nullptr))
                {
                gtk_tree_model_get_iter(store, &iter, tpath);
                gtk_tree_model_get(store, &iter, DUPE_COLUMN_POINTER, &di, -1);
@@ -3718,7 +3710,7 @@ static gboolean dupe_listview_release_cb(GtkWidget *widget, GdkEventButton *beve
                gtk_tree_selection_select_iter(selection, &iter);
 
                tpath = gtk_tree_model_get_path(store, &iter);
-               gtk_tree_view_set_cursor(GTK_TREE_VIEW(widget), tpath, NULL, FALSE);
+               gtk_tree_view_set_cursor(GTK_TREE_VIEW(widget), tpath, nullptr, FALSE);
                gtk_tree_path_free(tpath);
 
                return TRUE;
@@ -3785,58 +3777,58 @@ static void dupe_second_clear(DupeWindow *dw)
        gtk_tree_view_columns_autosize(GTK_TREE_VIEW(dw->second_listview));
 
        g_list_free(dw->dupes);
-       dw->dupes = NULL;
+       dw->dupes = nullptr;
 
-       dupe_list_free(dw->second_list);
-       dw->second_list = NULL;
+       g_list_free_full(dw->second_list, reinterpret_cast<GDestroyNotify>(dupe_item_free));
+       dw->second_list = nullptr;
 
        dupe_match_reset_list(dw->list);
 
        dupe_second_update_status(dw);
 }
 
-static void dupe_second_menu_view_cb(GtkWidget *UNUSED(widget), gpointer data)
+static void dupe_second_menu_view_cb(GtkWidget *, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
        if (dw->click_item) dupe_menu_view(dw, dw->click_item, dw->second_listview, FALSE);
 }
 
-static void dupe_second_menu_viewnew_cb(GtkWidget *UNUSED(widget), gpointer data)
+static void dupe_second_menu_viewnew_cb(GtkWidget *, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
        if (dw->click_item) dupe_menu_view(dw, dw->click_item, dw->second_listview, TRUE);
 }
 
-static void dupe_second_menu_select_all_cb(GtkWidget *UNUSED(widget), gpointer data)
+static void dupe_second_menu_select_all_cb(GtkWidget *, gpointer data)
 {
        GtkTreeSelection *selection;
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
        selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(dw->second_listview));
        gtk_tree_selection_select_all(selection);
 }
 
-static void dupe_second_menu_select_none_cb(GtkWidget *UNUSED(widget), gpointer data)
+static void dupe_second_menu_select_none_cb(GtkWidget *, gpointer data)
 {
        GtkTreeSelection *selection;
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
        selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(dw->second_listview));
        gtk_tree_selection_unselect_all(selection);
 }
 
-static void dupe_second_menu_remove_cb(GtkWidget *UNUSED(widget), gpointer data)
+static void dupe_second_menu_remove_cb(GtkWidget *, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
        dupe_window_remove_selection(dw, dw->second_listview);
 }
 
-static void dupe_second_menu_clear_cb(GtkWidget *UNUSED(widget), gpointer data)
+static void dupe_second_menu_clear_cb(GtkWidget *, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
        dupe_second_clear(dw);
        dupe_window_recompare(dw);
@@ -3845,8 +3837,8 @@ static void dupe_second_menu_clear_cb(GtkWidget *UNUSED(widget), gpointer data)
 static GtkWidget *dupe_menu_popup_second(DupeWindow *dw, DupeItem *di)
 {
        GtkWidget *menu;
-       gboolean notempty = (dw->second_list != NULL);
-       gboolean on_row = (di != NULL);
+       gboolean notempty = (dw->second_list != nullptr);
+       gboolean on_row = (di != nullptr);
        GtkAccelGroup *accel_group;
 
        menu = popup_menu_short_lived();
@@ -3858,7 +3850,7 @@ static GtkWidget *dupe_menu_popup_second(DupeWindow *dw, DupeItem *di)
 
        menu_item_add_sensitive(menu, _("_View"), on_row,
                                G_CALLBACK(dupe_second_menu_view_cb), dw);
-       menu_item_add_stock_sensitive(menu, _("View in _new window"), GTK_STOCK_NEW, on_row,
+       menu_item_add_icon_sensitive(menu, _("View in _new window"), GQ_ICON_NEW, on_row,
                                G_CALLBACK(dupe_second_menu_viewnew_cb), dw);
        menu_item_add_divider(menu);
        menu_item_add_sensitive(menu, _("Select all"), notempty,
@@ -3866,12 +3858,12 @@ static GtkWidget *dupe_menu_popup_second(DupeWindow *dw, DupeItem *di)
        menu_item_add_sensitive(menu, _("Select none"), notempty,
                                G_CALLBACK(dupe_second_menu_select_none_cb), dw);
        menu_item_add_divider(menu);
-       menu_item_add_stock_sensitive(menu, _("Rem_ove"), GTK_STOCK_REMOVE, on_row,
+       menu_item_add_icon_sensitive(menu, _("Rem_ove"), GQ_ICON_REMOVE, on_row,
                                      G_CALLBACK(dupe_second_menu_remove_cb), dw);
-       menu_item_add_stock_sensitive(menu, _("C_lear"), GTK_STOCK_CLEAR, notempty,
+       menu_item_add_icon_sensitive(menu, _("C_lear"), GQ_ICON_CLEAR, notempty,
                                   G_CALLBACK(dupe_second_menu_clear_cb), dw);
        menu_item_add_divider(menu);
-       menu_item_add_stock(menu, _("Close _window"), GTK_STOCK_CLOSE,
+       menu_item_add_icon(menu, _("Close _window"), GQ_ICON_CLOSE,
                            G_CALLBACK(dupe_menu_close_cb), dw);
 
        return menu;
@@ -3879,19 +3871,19 @@ static GtkWidget *dupe_menu_popup_second(DupeWindow *dw, DupeItem *di)
 
 static void dupe_second_set_toggle_cb(GtkWidget *widget, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
        dw->second_set = gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(widget));
 
        if (dw->second_set)
                {
                dupe_second_update_status(dw);
-               gtk_table_set_col_spacings(GTK_TABLE(dw->table), PREF_PAD_GAP);
+               gtk_grid_set_column_spacing(GTK_GRID(dw->table), PREF_PAD_GAP);
                gtk_widget_show(dw->second_vbox);
                }
        else
                {
-               gtk_table_set_col_spacings(GTK_TABLE(dw->table), 0);
+               gtk_grid_set_column_spacing(GTK_GRID(dw->table), 0);
                gtk_widget_hide(dw->second_vbox);
                dupe_second_clear(dw);
                }
@@ -3901,7 +3893,7 @@ static void dupe_second_set_toggle_cb(GtkWidget *widget, gpointer data)
 
 static void dupe_sort_totals_toggle_cb(GtkWidget *widget, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
        options->sort_totals = gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(widget));
        dupe_window_recompare(dw);
@@ -3923,7 +3915,7 @@ static void dupe_listview_show_rank(GtkWidget *listview, gboolean rank);
 
 static void dupe_menu_type_cb(GtkWidget *combo, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
        GtkTreeModel *store;
        GtkTreeIter iter;
 
@@ -3994,35 +3986,18 @@ static void dupe_menu_setup(DupeWindow *dw)
  *-------------------------------------------------------------------
  */
 
-/* this overrides the low default of a GtkCellRenderer from 100 to CELL_HEIGHT_OVERRIDE, something sane for our purposes */
-
-#define CELL_HEIGHT_OVERRIDE 512
-
-void cell_renderer_height_override(GtkCellRenderer *renderer)
-{
-       GParamSpec *spec;
-
-       spec = g_object_class_find_property(G_OBJECT_GET_CLASS(G_OBJECT(renderer)), "height");
-       if (spec && G_IS_PARAM_SPEC_INT(spec))
-               {
-               GParamSpecInt *spec_int;
-
-               spec_int = G_PARAM_SPEC_INT(spec);
-               if (spec_int->maximum < CELL_HEIGHT_OVERRIDE) spec_int->maximum = CELL_HEIGHT_OVERRIDE;
-               }
-}
-
-static GdkColor *dupe_listview_color_shifted(GtkWidget *widget)
+static GdkRGBA *dupe_listview_color_shifted(GtkWidget *widget)
 {
-       static GdkColor color;
-       static GtkWidget *done = NULL;
+       static GdkRGBA color;
+       static GtkWidget *done = nullptr;
 
        if (done != widget)
                {
                GtkStyle *style;
 
                style = gtk_widget_get_style(widget);
-               memcpy(&color, &style->base[GTK_STATE_NORMAL], sizeof(color));
+               convert_gdkcolor_to_gdkrgba(&style->base[GTK_STATE_NORMAL], &color);
+
                shift_color(&color, -1, 0);
                done = widget;
                }
@@ -4030,15 +4005,15 @@ static GdkColor *dupe_listview_color_shifted(GtkWidget *widget)
        return &color;
 }
 
-static void dupe_listview_color_cb(GtkTreeViewColumn *UNUSED(tree_column), GtkCellRenderer *cell,
+static void dupe_listview_color_cb(GtkTreeViewColumn *, GtkCellRenderer *cell,
                                   GtkTreeModel *tree_model, GtkTreeIter *iter, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
        gboolean set;
 
        gtk_tree_model_get(tree_model, iter, DUPE_COLUMN_COLOR, &set, -1);
        g_object_set(G_OBJECT(cell),
-                    "cell-background-gdk", dupe_listview_color_shifted(dw->listview),
+                    "cell-background-rgba", dupe_listview_color_shifted(dw->listview),
                     "cell-background-set", set, NULL);
 }
 
@@ -4081,7 +4056,7 @@ static void dupe_listview_add_column(DupeWindow *dw, GtkWidget *listview, gint n
        if (listview == dw->listview)
                {
                /* sets background before rendering */
-               gtk_tree_view_column_set_cell_data_func(column, renderer, dupe_listview_color_cb, dw, NULL);
+               gtk_tree_view_column_set_cell_data_func(column, renderer, dupe_listview_color_cb, dw, nullptr);
                }
 
        gtk_tree_view_append_column(GTK_TREE_VIEW(listview), column);
@@ -4126,7 +4101,7 @@ static void dupe_listview_show_rank(GtkWidget *listview, gboolean rank)
 
 static void dupe_window_show_thumb_cb(GtkWidget *widget, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
        dw->show_thumbs = gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(widget));
        options->duplicates_thumbnails = dw->show_thumbs;
@@ -4142,7 +4117,7 @@ static void dupe_window_show_thumb_cb(GtkWidget *widget, gpointer data)
                gboolean valid;
 
                thumb_loader_free(dw->thumb_loader);
-               dw->thumb_loader = NULL;
+               dw->thumb_loader = nullptr;
 
                store = gtk_tree_view_get_model(GTK_TREE_VIEW(dw->listview));
                valid = gtk_tree_model_get_iter_first(store, &iter);
@@ -4152,7 +4127,7 @@ static void dupe_window_show_thumb_cb(GtkWidget *widget, gpointer data)
                        gtk_list_store_set(GTK_LIST_STORE(store), &iter, DUPE_COLUMN_THUMB, NULL, -1);
                        valid = gtk_tree_model_iter_next(store, &iter);
                        }
-               dupe_window_update_progress(dw, NULL, 0.0, FALSE);
+               dupe_window_update_progress(dw, nullptr, 0.0, FALSE);
                }
 
        dupe_listview_set_height(dw->listview, dw->show_thumbs);
@@ -4160,7 +4135,7 @@ static void dupe_window_show_thumb_cb(GtkWidget *widget, gpointer data)
 
 static void dupe_window_rotation_invariant_cb(GtkWidget *widget, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
        options->rot_invariant_sim = gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(widget));
        dupe_window_recompare(dw);
@@ -4168,7 +4143,7 @@ static void dupe_window_rotation_invariant_cb(GtkWidget *widget, gpointer data)
 
 static void dupe_window_custom_threshold_cb(GtkWidget *widget, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
        DupeMatchType match_type;
        GtkTreeModel *store;
        gboolean valid;
@@ -4195,14 +4170,14 @@ static void dupe_window_custom_threshold_cb(GtkWidget *widget, gpointer data)
 
 static gboolean dupe_window_keypress_cb(GtkWidget *widget, GdkEventKey *event, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
        gboolean stop_signal = FALSE;
        gboolean on_second;
        GtkWidget *listview;
        GtkTreeModel *store;
        GtkTreeSelection *selection;
        GList *slist;
-       DupeItem *di = NULL;
+       DupeItem *di = nullptr;
 
        on_second = gtk_widget_has_focus(dw->second_listview);
 
@@ -4230,8 +4205,7 @@ static gboolean dupe_window_keypress_cb(GtkWidget *widget, GdkEventKey *event, g
                gtk_tree_model_get_iter(store, &iter, tpath);
                gtk_tree_model_get(store, &iter, DUPE_COLUMN_POINTER, &di, -1);
                }
-       g_list_foreach(slist, (GFunc)tree_path_free_wrapper, NULL);
-       g_list_free(slist);
+       g_list_free_full(slist, reinterpret_cast<GDestroyNotify>(gtk_tree_path_free));
 
        if (event->state & GDK_CONTROL_MASK)
                {
@@ -4252,19 +4226,19 @@ static gboolean dupe_window_keypress_cb(GtkWidget *widget, GdkEventKey *event, g
                                case '0':
                                        break;
                                case 'C': case 'c':
-                                       file_util_copy(NULL, dupe_listview_get_selection(dw, listview),
-                                                      NULL, dw->window);
+                                       file_util_copy(nullptr, dupe_listview_get_selection(dw, listview),
+                                                      nullptr, dw->window);
                                        break;
                                case 'M': case 'm':
-                                       file_util_move(NULL, dupe_listview_get_selection(dw, listview),
-                                                      NULL, dw->window);
+                                       file_util_move(nullptr, dupe_listview_get_selection(dw, listview),
+                                                      nullptr, dw->window);
                                        break;
                                case 'R': case 'r':
-                                       file_util_rename(NULL, dupe_listview_get_selection(dw, listview), dw->window);
+                                       file_util_rename(nullptr, dupe_listview_get_selection(dw, listview), dw->window);
                                        break;
                                case 'D': case 'd':
                                        options->file_ops.safe_delete_enable = TRUE;
-                                       file_util_delete(NULL, dupe_listview_get_selection(dw, listview), dw->window);
+                                       file_util_delete(nullptr, dupe_listview_get_selection(dw, listview), dw->window);
                                        break;
                                default:
                                        stop_signal = FALSE;
@@ -4314,6 +4288,21 @@ static gboolean dupe_window_keypress_cb(GtkWidget *widget, GdkEventKey *event, g
                                }
                        }
                }
+       else if (event->state & GDK_SHIFT_MASK)
+               {
+               stop_signal = TRUE;
+               switch (event->keyval)
+                       {
+                       case GDK_KEY_Delete:
+                       case GDK_KEY_KP_Delete:
+                               options->file_ops.safe_delete_enable = FALSE;
+                               file_util_delete_notify_done(nullptr, dupe_listview_get_selection(dw, dw->listview), dw->window, delete_finished_cb, dw);
+                               break;
+                       default:
+                               stop_signal = FALSE;
+                               break;
+                       }
+               }
        else
                {
                stop_signal = TRUE;
@@ -4353,14 +4342,14 @@ static gboolean dupe_window_keypress_cb(GtkWidget *widget, GdkEventKey *event, g
                                        GtkWidget *menu;
 
                                        menu = dupe_menu_popup_main(dw, di);
-                                       gtk_menu_popup_at_widget(GTK_MENU(menu), widget, GDK_GRAVITY_CENTER, GDK_GRAVITY_CENTER, NULL);
+                                       gtk_menu_popup_at_widget(GTK_MENU(menu), widget, GDK_GRAVITY_CENTER, GDK_GRAVITY_CENTER, nullptr);
                                        }
                                else
                                        {
                                        GtkWidget *menu;
 
                                        menu = dupe_menu_popup_second(dw, di);
-                                       gtk_menu_popup_at_widget(GTK_MENU(menu), widget, GDK_GRAVITY_CENTER, GDK_GRAVITY_CENTER, NULL);
+                                       gtk_menu_popup_at_widget(GTK_MENU(menu), widget, GDK_GRAVITY_CENTER, GDK_GRAVITY_CENTER, nullptr);
                                        }
                                break;
                        default:
@@ -4389,22 +4378,22 @@ void dupe_window_clear(DupeWindow *dw)
        gtk_tree_view_columns_autosize(GTK_TREE_VIEW(dw->listview));
 
        g_list_free(dw->dupes);
-       dw->dupes = NULL;
+       dw->dupes = nullptr;
 
-       dupe_list_free(dw->list);
-       dw->list = NULL;
+       g_list_free_full(dw->list, reinterpret_cast<GDestroyNotify>(dupe_item_free));
+       dw->list = nullptr;
        dw->set_count = 0;
 
        dupe_match_reset_list(dw->second_list);
 
        dupe_window_update_count(dw, FALSE);
-       dupe_window_update_progress(dw, NULL, 0.0, FALSE);
+       dupe_window_update_progress(dw, nullptr, 0.0, FALSE);
 }
 
 static void dupe_window_get_geometry(DupeWindow *dw)
 {
        GdkWindow *window;
-       LayoutWindow *lw = NULL;
+       LayoutWindow *lw = nullptr;
 
        layout_valid(&lw);
 
@@ -4423,12 +4412,12 @@ void dupe_window_close(DupeWindow *dw)
        dupe_window_get_geometry(dw);
 
        dupe_window_list = g_list_remove(dupe_window_list, dw);
-       gtk_widget_destroy(dw->window);
+       gq_gtk_widget_destroy(dw->window);
 
        g_list_free(dw->dupes);
-       dupe_list_free(dw->list);
+       g_list_free_full(dw->list, reinterpret_cast<GDestroyNotify>(dupe_item_free));
 
-       dupe_list_free(dw->second_list);
+       g_list_free_full(dw->second_list, reinterpret_cast<GDestroyNotify>(dupe_item_free));
 
        file_data_unregister_notify_func(dupe_notify_cb, dw);
 
@@ -4437,38 +4426,39 @@ void dupe_window_close(DupeWindow *dw)
        g_free(dw);
 }
 
-static gint dupe_window_close_cb(GtkWidget *UNUSED(widget), gpointer data)
+static gint dupe_window_close_cb(GtkWidget *, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
        dupe_window_close(dw);
 
        return TRUE;
 }
 
-static gint dupe_window_delete(GtkWidget *UNUSED(widget), GdkEvent *UNUSED(event), gpointer data)
+static gint dupe_window_delete(GtkWidget *, GdkEvent *, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
        dupe_window_close(dw);
 
        return TRUE;
 }
 
-static void dupe_help_cb(GtkAction *UNUSED(action), gpointer UNUSED(data))
+static void dupe_help_cb(GtkAction *, gpointer)
 {
        help_window_show("GuideImageSearchFindingDuplicates.html");
 }
 
-static gint default_sort_cb(GtkTreeModel *UNUSED(model), GtkTreeIter *UNUSED(a), GtkTreeIter *UNUSED(b), gpointer UNUSED(data))
+static gint default_sort_cb(GtkTreeModel *, GtkTreeIter *, GtkTreeIter *, gpointer)
 {
        return 0;
 }
 
 static gint column_sort_cb(GtkTreeModel *model, GtkTreeIter *a, GtkTreeIter *b, gpointer data)
 {
-       GtkTreeSortable *sortable = static_cast<GtkTreeSortable *>(data);
+       auto sortable = static_cast<GtkTreeSortable *>(data);
        gint ret = 0;
-       gchar *rank_str_a, *rank_str_b;
+       gchar *rank_str_a;
+       gchar *rank_str_b;
        gint rank_int_a;
        gint rank_int_b;
        gint group_a;
@@ -4553,9 +4543,9 @@ static gint column_sort_cb(GtkTreeModel *model, GtkTreeIter *a, GtkTreeIter *b,
        return ret;
 }
 
-static void column_clicked_cb(GtkWidget *UNUSED(widget),  gpointer data)
+static void column_clicked_cb(GtkWidget *,  gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
        options->duplicates_match = DUPE_SELECT_NONE;
        dupe_listview_select_dupes(dw, DUPE_SELECT_NONE);
@@ -4577,12 +4567,12 @@ DupeWindow *dupe_window_new()
        GtkListStore *store;
        GtkTreeSelection *selection;
        GdkGeometry geometry;
-       LayoutWindow *lw = NULL;
+       LayoutWindow *lw = nullptr;
 
        layout_valid(&lw);
 
        dw = g_new0(DupeWindow, 1);
-       dw->add_files_queue = NULL;
+       dw->add_files_queue = nullptr;
        dw->add_files_queue_id = 0;
 
        dw->match_mask = DUPE_MATCH_NAME;
@@ -4601,20 +4591,20 @@ DupeWindow *dupe_window_new()
        if (options->duplicates_match == DUPE_MATCH_NAME_CI_CONTENT) dw->match_mask = DUPE_MATCH_NAME_CI_CONTENT;
        if (options->duplicates_match == DUPE_MATCH_ALL) dw->match_mask = DUPE_MATCH_ALL;
 
-       dw->window = window_new(GTK_WINDOW_TOPLEVEL, "dupe", NULL, NULL, _("Find duplicates"));
+       dw->window = window_new("dupe", nullptr, nullptr, _("Find duplicates"));
        DEBUG_NAME(dw->window);
 
        geometry.min_width = DEFAULT_MINIMAL_WINDOW_SIZE;
        geometry.min_height = DEFAULT_MINIMAL_WINDOW_SIZE;
        geometry.base_width = DUPE_DEF_WIDTH;
        geometry.base_height = DUPE_DEF_HEIGHT;
-       gtk_window_set_geometry_hints(GTK_WINDOW(dw->window), NULL, &geometry,
-                                     GDK_HINT_MIN_SIZE | GDK_HINT_BASE_SIZE);
+       gtk_window_set_geometry_hints(GTK_WINDOW(dw->window), nullptr, &geometry,
+                                     static_cast<GdkWindowHints>(GDK_HINT_MIN_SIZE | GDK_HINT_BASE_SIZE));
 
        if (lw && options->save_window_positions)
                {
                gtk_window_set_default_size(GTK_WINDOW(dw->window), lw->options.dupe_window.w, lw->options.dupe_window.h);
-               gtk_window_move(GTK_WINDOW(dw->window), lw->options.dupe_window.x, lw->options.dupe_window.y);
+               gq_gtk_window_move(GTK_WINDOW(dw->window), lw->options.dupe_window.x, lw->options.dupe_window.y);
                }
        else
                {
@@ -4630,17 +4620,19 @@ DupeWindow *dupe_window_new()
                         G_CALLBACK(dupe_window_keypress_cb), dw);
 
        vbox = gtk_box_new(GTK_ORIENTATION_VERTICAL, 0);
-       gtk_container_add(GTK_CONTAINER(dw->window), vbox);
+       gq_gtk_container_add(GTK_WIDGET(dw->window), vbox);
        gtk_widget_show(vbox);
 
-       dw->table = gtk_table_new(1, 3, FALSE);
-       gtk_box_pack_start(GTK_BOX(vbox), dw->table, TRUE, TRUE, 0);
+       dw->table = gtk_grid_new();
+       gq_gtk_box_pack_start(GTK_BOX(vbox), dw->table, TRUE, TRUE, 0);
+       gtk_grid_set_row_homogeneous(GTK_GRID(dw->table), TRUE);
+       gtk_grid_set_column_homogeneous(GTK_GRID(dw->table), TRUE);
        gtk_widget_show(dw->table);
 
-       scrolled = gtk_scrolled_window_new(NULL, NULL);
-       gtk_scrolled_window_set_shadow_type(GTK_SCROLLED_WINDOW(scrolled), GTK_SHADOW_IN);
+       scrolled = gq_gtk_scrolled_window_new(nullptr, nullptr);
+       gq_gtk_scrolled_window_set_shadow_type(GTK_SCROLLED_WINDOW(scrolled), GTK_SHADOW_IN);
        gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(scrolled), GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
-       gtk_table_attach_defaults(GTK_TABLE(dw->table), scrolled, 0, 2, 0, 1);
+       gtk_grid_attach(GTK_GRID(dw->table), scrolled, 0, 0, 2, 1);
        gtk_widget_show(scrolled);
 
        store = gtk_list_store_new(DUPE_COLUMN_COUNT, G_TYPE_POINTER, G_TYPE_STRING, GDK_TYPE_PIXBUF, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_STRING, G_TYPE_BOOLEAN, G_TYPE_INT, G_TYPE_INT);
@@ -4649,14 +4641,14 @@ DupeWindow *dupe_window_new()
 
        dw->sortable = GTK_TREE_SORTABLE(store);
 
-       gtk_tree_sortable_set_sort_func(dw->sortable, DUPE_COLUMN_RANK, column_sort_cb, dw->sortable, NULL);
-       gtk_tree_sortable_set_sort_func(dw->sortable, DUPE_COLUMN_SET, default_sort_cb, dw->sortable, NULL);
-       gtk_tree_sortable_set_sort_func(dw->sortable, DUPE_COLUMN_THUMB, default_sort_cb, dw->sortable, NULL);
-       gtk_tree_sortable_set_sort_func(dw->sortable, DUPE_COLUMN_NAME, column_sort_cb, dw->sortable, NULL);
-       gtk_tree_sortable_set_sort_func(dw->sortable, DUPE_COLUMN_SIZE, column_sort_cb, dw->sortable, NULL);
-       gtk_tree_sortable_set_sort_func(dw->sortable, DUPE_COLUMN_DATE, column_sort_cb, dw->sortable, NULL);
-       gtk_tree_sortable_set_sort_func(dw->sortable, DUPE_COLUMN_DIMENSIONS, column_sort_cb, dw->sortable, NULL);
-       gtk_tree_sortable_set_sort_func(dw->sortable, DUPE_COLUMN_PATH, column_sort_cb, dw->sortable, NULL);
+       gtk_tree_sortable_set_sort_func(dw->sortable, DUPE_COLUMN_RANK, column_sort_cb, dw->sortable, nullptr);
+       gtk_tree_sortable_set_sort_func(dw->sortable, DUPE_COLUMN_SET, default_sort_cb, dw->sortable, nullptr);
+       gtk_tree_sortable_set_sort_func(dw->sortable, DUPE_COLUMN_THUMB, default_sort_cb, dw->sortable, nullptr);
+       gtk_tree_sortable_set_sort_func(dw->sortable, DUPE_COLUMN_NAME, column_sort_cb, dw->sortable, nullptr);
+       gtk_tree_sortable_set_sort_func(dw->sortable, DUPE_COLUMN_SIZE, column_sort_cb, dw->sortable, nullptr);
+       gtk_tree_sortable_set_sort_func(dw->sortable, DUPE_COLUMN_DATE, column_sort_cb, dw->sortable, nullptr);
+       gtk_tree_sortable_set_sort_func(dw->sortable, DUPE_COLUMN_DIMENSIONS, column_sort_cb, dw->sortable, nullptr);
+       gtk_tree_sortable_set_sort_func(dw->sortable, DUPE_COLUMN_PATH, column_sort_cb, dw->sortable, nullptr);
 
        selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(dw->listview));
        gtk_tree_selection_set_mode(GTK_TREE_SELECTION(selection), GTK_SELECTION_MULTIPLE);
@@ -4679,25 +4671,25 @@ DupeWindow *dupe_window_new()
        g_signal_connect(gtk_tree_view_get_column(GTK_TREE_VIEW(dw->listview), DUPE_COLUMN_DIMENSIONS - 1), "clicked", (GCallback)column_clicked_cb, dw);
        g_signal_connect(gtk_tree_view_get_column(GTK_TREE_VIEW(dw->listview), DUPE_COLUMN_PATH - 1), "clicked", (GCallback)column_clicked_cb, dw);
 
-       gtk_container_add(GTK_CONTAINER(scrolled), dw->listview);
+       gq_gtk_container_add(GTK_WIDGET(scrolled), dw->listview);
        gtk_widget_show(dw->listview);
 
        dw->second_vbox = gtk_box_new(GTK_ORIENTATION_VERTICAL, 0);
-       gtk_table_attach_defaults(GTK_TABLE(dw->table), dw->second_vbox, 2, 3, 0, 1);
+       gtk_grid_attach(GTK_GRID(dw->table), dw->second_vbox, 2, 0, 3, 1);
        if (dw->second_set)
                {
-               gtk_table_set_col_spacings(GTK_TABLE(dw->table), PREF_PAD_GAP);
+               gtk_grid_set_column_spacing(GTK_GRID(dw->table), PREF_PAD_GAP);
                gtk_widget_show(dw->second_vbox);
                }
        else
                {
-               gtk_table_set_col_spacings(GTK_TABLE(dw->table), 0);
+               gtk_grid_set_column_spacing(GTK_GRID(dw->table), 0);
                }
 
-       scrolled = gtk_scrolled_window_new(NULL, NULL);
-       gtk_scrolled_window_set_shadow_type(GTK_SCROLLED_WINDOW(scrolled), GTK_SHADOW_IN);
+       scrolled = gq_gtk_scrolled_window_new(nullptr, nullptr);
+       gq_gtk_scrolled_window_set_shadow_type(GTK_SCROLLED_WINDOW(scrolled), GTK_SHADOW_IN);
        gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(scrolled), GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
-       gtk_box_pack_start(GTK_BOX(dw->second_vbox), scrolled, TRUE, TRUE, 0);
+       gq_gtk_box_pack_start(GTK_BOX(dw->second_vbox), scrolled, TRUE, TRUE, 0);
        gtk_widget_show(scrolled);
 
        store = gtk_list_store_new(2, G_TYPE_POINTER, G_TYPE_STRING);
@@ -4711,34 +4703,34 @@ DupeWindow *dupe_window_new()
 
        dupe_listview_add_column(dw, dw->second_listview, 1, _("Compare to:"), FALSE, FALSE);
 
-       gtk_container_add(GTK_CONTAINER(scrolled), dw->second_listview);
+       gq_gtk_container_add(GTK_WIDGET(scrolled), dw->second_listview);
        gtk_widget_show(dw->second_listview);
 
        dw->second_status_label = gtk_label_new("");
-       gtk_box_pack_start(GTK_BOX(dw->second_vbox), dw->second_status_label, FALSE, FALSE, 0);
+       gq_gtk_box_pack_start(GTK_BOX(dw->second_vbox), dw->second_status_label, FALSE, FALSE, 0);
        gtk_widget_show(dw->second_status_label);
 
        pref_line(dw->second_vbox, GTK_ORIENTATION_HORIZONTAL);
 
        status_box = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 0);
-       gtk_box_pack_start(GTK_BOX(vbox), status_box, FALSE, FALSE, 0);
+       gq_gtk_box_pack_start(GTK_BOX(vbox), status_box, FALSE, FALSE, 0);
        gtk_widget_show(status_box);
 
-       frame = gtk_frame_new(NULL);
+       frame = gtk_frame_new(nullptr);
        DEBUG_NAME(frame);
-       gtk_frame_set_shadow_type(GTK_FRAME(frame), GTK_SHADOW_IN);
-       gtk_box_pack_start(GTK_BOX(status_box), frame, TRUE, TRUE, 0);
+       gq_gtk_frame_set_shadow_type(GTK_FRAME(frame), GTK_SHADOW_IN);
+       gq_gtk_box_pack_start(GTK_BOX(status_box), frame, TRUE, TRUE, 0);
        gtk_widget_show(frame);
 
        dw->status_label = gtk_label_new("");
-       gtk_container_add(GTK_CONTAINER(frame), dw->status_label);
+       gq_gtk_container_add(GTK_WIDGET(frame), dw->status_label);
        gtk_widget_show(dw->status_label);
 
        dw->extra_label = gtk_progress_bar_new();
        gtk_progress_bar_set_fraction(GTK_PROGRESS_BAR(dw->extra_label), 0.0);
        gtk_progress_bar_set_text(GTK_PROGRESS_BAR(dw->extra_label), "");
        gtk_progress_bar_set_show_text(GTK_PROGRESS_BAR(dw->extra_label), TRUE);
-       gtk_box_pack_start(GTK_BOX(status_box), dw->extra_label, FALSE, FALSE, PREF_PAD_SPACE);
+       gq_gtk_box_pack_start(GTK_BOX(status_box), dw->extra_label, FALSE, FALSE, PREF_PAD_SPACE);
        gtk_widget_show(dw->extra_label);
 
        controls_box = pref_box_new(vbox, FALSE, GTK_ORIENTATION_HORIZONTAL, 0);
@@ -4750,73 +4742,73 @@ DupeWindow *dupe_window_new()
        gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(dw->button_thumbs), dw->show_thumbs);
        g_signal_connect(G_OBJECT(dw->button_thumbs), "toggled",
                         G_CALLBACK(dupe_window_show_thumb_cb), dw);
-       gtk_box_pack_start(GTK_BOX(controls_box), dw->button_thumbs, FALSE, FALSE, PREF_PAD_SPACE);
+       gq_gtk_box_pack_start(GTK_BOX(controls_box), dw->button_thumbs, FALSE, FALSE, PREF_PAD_SPACE);
        gtk_widget_show(dw->button_thumbs);
 
        label = gtk_label_new(_("Compare by:"));
-       gtk_box_pack_start(GTK_BOX(controls_box), label, FALSE, FALSE, PREF_PAD_SPACE);
+       gq_gtk_box_pack_start(GTK_BOX(controls_box), label, FALSE, FALSE, PREF_PAD_SPACE);
        gtk_widget_show(label);
 
        dupe_menu_setup(dw);
-       gtk_box_pack_start(GTK_BOX(controls_box), dw->combo, FALSE, FALSE, 0);
+       gq_gtk_box_pack_start(GTK_BOX(controls_box), dw->combo, FALSE, FALSE, 0);
        gtk_widget_show(dw->combo);
 
        label = gtk_label_new(_("Custom Threshold"));
-       gtk_box_pack_start(GTK_BOX(controls_box), label, FALSE, FALSE, PREF_PAD_SPACE);
+       gq_gtk_box_pack_start(GTK_BOX(controls_box), label, FALSE, FALSE, PREF_PAD_SPACE);
        gtk_widget_show(label);
        dw->custom_threshold = gtk_spin_button_new_with_range(1, 100, 1);
        gtk_widget_set_tooltip_text(GTK_WIDGET(dw->custom_threshold), "Custom similarity threshold\n(Use tab key to set value)");
        gtk_spin_button_set_value(GTK_SPIN_BUTTON(dw->custom_threshold), options->duplicates_similarity_threshold);
        g_signal_connect(G_OBJECT(dw->custom_threshold), "value_changed", G_CALLBACK(dupe_window_custom_threshold_cb), dw);
-       gtk_box_pack_start(GTK_BOX(controls_box), dw->custom_threshold, FALSE, FALSE, PREF_PAD_SPACE);
+       gq_gtk_box_pack_start(GTK_BOX(controls_box), dw->custom_threshold, FALSE, FALSE, PREF_PAD_SPACE);
        gtk_widget_show(dw->custom_threshold);
 
        button = gtk_check_button_new_with_label(_("Sort"));
-       gtk_widget_set_tooltip_text(GTK_WIDGET(button), "Sort by group totals");
+       gtk_widget_set_tooltip_text(GTK_WIDGET(button), _("Sort by group totals"));
        gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(button), options->sort_totals);
        g_signal_connect(G_OBJECT(button), "toggled", G_CALLBACK(dupe_sort_totals_toggle_cb), dw);
-       gtk_box_pack_start(GTK_BOX(controls_box), button, FALSE, FALSE, PREF_PAD_SPACE);
+       gq_gtk_box_pack_start(GTK_BOX(controls_box), button, FALSE, FALSE, PREF_PAD_SPACE);
        gtk_widget_show(button);
 
        dw->button_rotation_invariant = gtk_check_button_new_with_label(_("Ignore Orientation"));
-       gtk_widget_set_tooltip_text(GTK_WIDGET(dw->button_rotation_invariant), "Ignore image orientation");
+       gtk_widget_set_tooltip_text(GTK_WIDGET(dw->button_rotation_invariant), _("Ignore image orientation"));
        gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(dw->button_rotation_invariant), options->rot_invariant_sim);
        g_signal_connect(G_OBJECT(dw->button_rotation_invariant), "toggled",
                         G_CALLBACK(dupe_window_rotation_invariant_cb), dw);
-       gtk_box_pack_start(GTK_BOX(controls_box), dw->button_rotation_invariant, FALSE, FALSE, PREF_PAD_SPACE);
+       gq_gtk_box_pack_start(GTK_BOX(controls_box), dw->button_rotation_invariant, FALSE, FALSE, PREF_PAD_SPACE);
        gtk_widget_show(dw->button_rotation_invariant);
 
        button = gtk_check_button_new_with_label(_("Compare two file sets"));
        gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(button), dw->second_set);
        g_signal_connect(G_OBJECT(button), "toggled",
                         G_CALLBACK(dupe_second_set_toggle_cb), dw);
-       gtk_box_pack_start(GTK_BOX(controls_box), button, FALSE, FALSE, PREF_PAD_SPACE);
+       gq_gtk_box_pack_start(GTK_BOX(controls_box), button, FALSE, FALSE, PREF_PAD_SPACE);
        gtk_widget_show(button);
 
        button_box = gtk_box_new(GTK_ORIENTATION_HORIZONTAL, 0);
-       gtk_box_pack_start(GTK_BOX(vbox), button_box, FALSE, FALSE, 0);
+       gq_gtk_box_pack_start(GTK_BOX(vbox), button_box, FALSE, FALSE, 0);
        gtk_widget_show(button_box);
 
-       hbox = gtk_hbutton_box_new();
+       hbox = gtk_button_box_new(GTK_ORIENTATION_HORIZONTAL);
        gtk_button_box_set_layout(GTK_BUTTON_BOX(hbox), GTK_BUTTONBOX_END);
        gtk_box_set_spacing(GTK_BOX(hbox), PREF_PAD_SPACE);
-       gtk_box_pack_end(GTK_BOX(button_box), hbox, FALSE, FALSE, 0);
+       gq_gtk_box_pack_end(GTK_BOX(button_box), hbox, FALSE, FALSE, 0);
        gtk_widget_show(hbox);
 
-       button = pref_button_new(NULL, GTK_STOCK_HELP, NULL, FALSE, G_CALLBACK(dupe_help_cb), NULL);
+       button = pref_button_new(nullptr, GQ_ICON_HELP, _("Help"), G_CALLBACK(dupe_help_cb), nullptr);
        gtk_widget_set_tooltip_text(GTK_WIDGET(button), "F1");
-       gtk_container_add(GTK_CONTAINER(hbox), button);
+       gq_gtk_container_add(GTK_WIDGET(hbox), button);
        gtk_widget_set_can_default(button, TRUE);
        gtk_widget_show(button);
 
-       button = pref_button_new(NULL, GTK_STOCK_STOP, NULL, FALSE, G_CALLBACK(dupe_check_stop_cb), dw);
-       gtk_container_add(GTK_CONTAINER(hbox), button);
+       button = pref_button_new(nullptr, GQ_ICON_STOP, _("Stop"), G_CALLBACK(dupe_check_stop_cb), dw);
+       gq_gtk_container_add(GTK_WIDGET(hbox), button);
        gtk_widget_set_can_default(button, TRUE);
        gtk_widget_show(button);
 
-       button = pref_button_new(NULL, GTK_STOCK_CLOSE, NULL, FALSE, G_CALLBACK(dupe_window_close_cb), dw);
+       button = pref_button_new(nullptr, GQ_ICON_CLOSE, _("Close"), G_CALLBACK(dupe_window_close_cb), dw);
        gtk_widget_set_tooltip_text(GTK_WIDGET(button), "Ctrl-W");
-       gtk_container_add(GTK_CONTAINER(hbox), button);
+       gq_gtk_container_add(GTK_WIDGET(hbox), button);
        gtk_widget_set_can_default(button, TRUE);
        gtk_widget_grab_default(button);
        gtk_widget_show(button);
@@ -4840,7 +4832,7 @@ DupeWindow *dupe_window_new()
        g_signal_emit_by_name(G_OBJECT(dw->combo), "changed");
 
        dupe_window_update_count(dw, TRUE);
-       dupe_window_update_progress(dw, NULL, 0.0, FALSE);
+       dupe_window_update_progress(dw, nullptr, 0.0, FALSE);
 
        dupe_window_list = g_list_append(dupe_window_list, dw);
 
@@ -4848,7 +4840,7 @@ DupeWindow *dupe_window_new()
 
        g_mutex_init(&dw->thread_count_mutex);
        g_mutex_init(&dw->search_matches_mutex);
-       dw->dupe_comparison_thread_pool = g_thread_pool_new(dupe_comparison_func, dw, options->threads.duplicates, FALSE, NULL);
+       dw->dupe_comparison_thread_pool = g_thread_pool_new(dupe_comparison_func, dw, options->threads.duplicates, FALSE, nullptr);
 
        return dw;
 }
@@ -4859,19 +4851,19 @@ DupeWindow *dupe_window_new()
  *-------------------------------------------------------------------
  */
 
-typedef struct {
+struct CDupeConfirmD {
        DupeWindow *dw;
        GList *list;
-} CDupeConfirmD;
+};
 
-static void confirm_dir_list_cancel(GtkWidget *UNUSED(widget), gpointer UNUSED(data))
+static void confirm_dir_list_cancel(GtkWidget *, gpointer)
 {
        /* do nothing */
 }
 
-static void confirm_dir_list_add(GtkWidget *UNUSED(widget), gpointer data)
+static void confirm_dir_list_add(GtkWidget *, gpointer data)
 {
-       CDupeConfirmD *d = static_cast<CDupeConfirmD *>(data);
+       auto d = static_cast<CDupeConfirmD *>(data);
        GList *work;
 
        dupe_window_add_files(d->dw, d->list, FALSE);
@@ -4879,13 +4871,13 @@ static void confirm_dir_list_add(GtkWidget *UNUSED(widget), gpointer data)
        work = d->list;
        while (work)
                {
-               FileData *fd = static_cast<FileData *>(work->data);
+               auto fd = static_cast<FileData *>(work->data);
                work = work->next;
                if (isdir(fd->path))
                        {
                        GList *list;
 
-                       filelist_read(fd, &list, NULL);
+                       filelist_read(fd, &list, nullptr);
                        list = filelist_filter(list, FALSE);
                        if (list)
                                {
@@ -4896,21 +4888,21 @@ static void confirm_dir_list_add(GtkWidget *UNUSED(widget), gpointer data)
                }
 }
 
-static void confirm_dir_list_recurse(GtkWidget *UNUSED(widget), gpointer data)
+static void confirm_dir_list_recurse(GtkWidget *, gpointer data)
 {
-       CDupeConfirmD *d = static_cast<CDupeConfirmD *>(data);
+       auto d = static_cast<CDupeConfirmD *>(data);
        dupe_window_add_files(d->dw, d->list, TRUE);
 }
 
-static void confirm_dir_list_skip(GtkWidget *UNUSED(widget), gpointer data)
+static void confirm_dir_list_skip(GtkWidget *, gpointer data)
 {
-       CDupeConfirmD *d = static_cast<CDupeConfirmD *>(data);
+       auto d = static_cast<CDupeConfirmD *>(data);
        dupe_window_add_files(d->dw, d->list, FALSE);
 }
 
-static void confirm_dir_list_destroy(GtkWidget *UNUSED(widget), gpointer data)
+static void confirm_dir_list_destroy(GtkWidget *, gpointer data)
 {
-       CDupeConfirmD *d = static_cast<CDupeConfirmD *>(data);
+       auto d = static_cast<CDupeConfirmD *>(data);
        filelist_free(d->list);
        g_free(d);
 }
@@ -4928,13 +4920,13 @@ static GtkWidget *dupe_confirm_dir_list(DupeWindow *dw, GList *list)
        g_signal_connect(G_OBJECT(menu), "destroy",
                         G_CALLBACK(confirm_dir_list_destroy), d);
 
-       menu_item_add_stock(menu, _("Dropped list includes folders."), GTK_STOCK_DND_MULTIPLE, NULL, NULL);
+       menu_item_add_stock(menu, _("Dropped list includes folders."), GQ_ICON_DND, nullptr, nullptr);
        menu_item_add_divider(menu);
-       menu_item_add_stock(menu, _("_Add contents"), GTK_STOCK_OK, G_CALLBACK(confirm_dir_list_add), d);
-       menu_item_add_stock(menu, _("Add contents _recursive"), GTK_STOCK_ADD, G_CALLBACK(confirm_dir_list_recurse), d);
-       menu_item_add_stock(menu, _("_Skip folders"), GTK_STOCK_REMOVE, G_CALLBACK(confirm_dir_list_skip), d);
+       menu_item_add_icon(menu, _("_Add contents"), GQ_ICON_OK, G_CALLBACK(confirm_dir_list_add), d);
+       menu_item_add_icon(menu, _("Add contents _recursive"), GQ_ICON_ADD, G_CALLBACK(confirm_dir_list_recurse), d);
+       menu_item_add_icon(menu, _("_Skip folders"), GQ_ICON_REMOVE, G_CALLBACK(confirm_dir_list_skip), d);
        menu_item_add_divider(menu);
-       menu_item_add_stock(menu, _("Cancel"), GTK_STOCK_CANCEL, G_CALLBACK(confirm_dir_list_cancel), d);
+       menu_item_add_icon(menu, _("Cancel"), GQ_ICON_CANCEL, G_CALLBACK(confirm_dir_list_cancel), d);
 
        return menu;
 }
@@ -4946,22 +4938,22 @@ static GtkWidget *dupe_confirm_dir_list(DupeWindow *dw, GList *list)
  */
 
 static GtkTargetEntry dupe_drag_types[] = {
-       { "text/uri-list", 0, TARGET_URI_LIST },
-       { "text/plain", 0, TARGET_TEXT_PLAIN }
+       { const_cast<gchar *>("text/uri-list"), 0, TARGET_URI_LIST },
+       { const_cast<gchar *>("text/plain"), 0, TARGET_TEXT_PLAIN }
 };
 static gint n_dupe_drag_types = 2;
 
 static GtkTargetEntry dupe_drop_types[] = {
-       { TARGET_APP_COLLECTION_MEMBER_STRING, 0, TARGET_APP_COLLECTION_MEMBER },
-       { "text/uri-list", 0, TARGET_URI_LIST }
+       { const_cast<gchar *>(TARGET_APP_COLLECTION_MEMBER_STRING), 0, TARGET_APP_COLLECTION_MEMBER },
+       { const_cast<gchar *>("text/uri-list"), 0, TARGET_URI_LIST }
 };
 static gint n_dupe_drop_types = 2;
 
-static void dupe_dnd_data_set(GtkWidget *widget, GdkDragContext *UNUSED(context),
+static void dupe_dnd_data_set(GtkWidget *widget, GdkDragContext *,
                              GtkSelectionData *selection_data, guint info,
-                             guint UNUSED(time), gpointer data)
+                             guint, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
        GList *list;
 
        switch (info)
@@ -4979,18 +4971,18 @@ static void dupe_dnd_data_set(GtkWidget *widget, GdkDragContext *UNUSED(context)
 }
 
 static void dupe_dnd_data_get(GtkWidget *widget, GdkDragContext *context,
-                             gint UNUSED(x), gint UNUSED(y),
+                             gint, gint,
                              GtkSelectionData *selection_data, guint info,
-                             guint UNUSED(time), gpointer data)
+                             guint, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
        GtkWidget *source;
-       GList *list = NULL;
+       GList *list = nullptr;
        GList *work;
 
        if (dw->add_files_queue_id > 0)
                {
-               warning_dialog(_("Find duplicates"), _("Please wait for the current file selection to be loaded."), GTK_STOCK_DIALOG_INFO, dw->window);
+               warning_dialog(_("Find duplicates"), _("Please wait for the current file selection to be loaded."), GQ_ICON_DIALOG_INFO, dw->window);
 
                return;
                }
@@ -5003,26 +4995,26 @@ static void dupe_dnd_data_get(GtkWidget *widget, GdkDragContext *context,
        switch (info)
                {
                case TARGET_APP_COLLECTION_MEMBER:
-                       collection_from_dnd_data((gchar *)gtk_selection_data_get_data(selection_data), &list, NULL);
+                       collection_from_dnd_data(reinterpret_cast<const gchar *>(gtk_selection_data_get_data(selection_data)), &list, nullptr);
                        break;
                case TARGET_URI_LIST:
                        list = uri_filelist_from_gtk_selection_data(selection_data);
                        work = list;
                        while (work)
                                {
-                               FileData *fd = static_cast<FileData *>(work->data);
+                               auto fd = static_cast<FileData *>(work->data);
                                if (isdir(fd->path))
                                        {
                                        GtkWidget *menu;
                                        menu = dupe_confirm_dir_list(dw, list);
-                                       gtk_menu_popup_at_pointer(GTK_MENU(menu), NULL);
+                                       gtk_menu_popup_at_pointer(GTK_MENU(menu), nullptr);
                                        return;
                                        }
                                work = work->next;
                                }
                        break;
                default:
-                       list = NULL;
+                       list = nullptr;
                        break;
                }
 
@@ -5038,9 +5030,9 @@ static void dupe_dest_set(GtkWidget *widget, gboolean enable)
        if (enable)
                {
                gtk_drag_dest_set(widget,
-                       GTK_DEST_DEFAULT_MOTION | GTK_DEST_DEFAULT_HIGHLIGHT | GTK_DEST_DEFAULT_DROP,
+                       static_cast<GtkDestDefaults>(GTK_DEST_DEFAULT_MOTION | GTK_DEST_DEFAULT_HIGHLIGHT | GTK_DEST_DEFAULT_DROP),
                        dupe_drop_types, n_dupe_drop_types,
-                       GDK_ACTION_COPY | GDK_ACTION_MOVE | GDK_ACTION_ASK);
+                       static_cast<GdkDragAction>(GDK_ACTION_COPY | GDK_ACTION_MOVE | GDK_ACTION_ASK));
 
                }
        else
@@ -5051,7 +5043,7 @@ static void dupe_dest_set(GtkWidget *widget, gboolean enable)
 
 static void dupe_dnd_begin(GtkWidget *widget, GdkDragContext *context, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
        dupe_dest_set(dw->listview, FALSE);
        dupe_dest_set(dw->second_listview, FALSE);
 
@@ -5071,7 +5063,7 @@ static void dupe_dnd_begin(GtkWidget *widget, GdkDragContext *context, gpointer
                        gtk_tree_selection_select_iter(selection, &iter);
 
                        tpath = gtk_tree_model_get_path(GTK_TREE_MODEL(store), &iter);
-                       gtk_tree_view_set_cursor(GTK_TREE_VIEW(widget), tpath, NULL, FALSE);
+                       gtk_tree_view_set_cursor(GTK_TREE_VIEW(widget), tpath, nullptr, FALSE);
                        gtk_tree_path_free(tpath);
                        }
                }
@@ -5089,18 +5081,18 @@ static void dupe_dnd_begin(GtkWidget *widget, GdkDragContext *context, gpointer
                }
 }
 
-static void dupe_dnd_end(GtkWidget *UNUSED(widget), GdkDragContext *UNUSED(context), gpointer data)
+static void dupe_dnd_end(GtkWidget *, GdkDragContext *, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
        dupe_dest_set(dw->listview, TRUE);
        dupe_dest_set(dw->second_listview, TRUE);
 }
 
 static void dupe_dnd_init(DupeWindow *dw)
 {
-       gtk_drag_source_set(dw->listview, GDK_BUTTON1_MASK | GDK_BUTTON2_MASK,
+       gtk_drag_source_set(dw->listview, static_cast<GdkModifierType>(GDK_BUTTON1_MASK | GDK_BUTTON2_MASK),
                            dupe_drag_types, n_dupe_drag_types,
-                           GDK_ACTION_COPY | GDK_ACTION_MOVE | GDK_ACTION_LINK);
+                           static_cast<GdkDragAction>(GDK_ACTION_COPY | GDK_ACTION_MOVE | GDK_ACTION_LINK));
        g_signal_connect(G_OBJECT(dw->listview), "drag_data_get",
                         G_CALLBACK(dupe_dnd_data_set), dw);
        g_signal_connect(G_OBJECT(dw->listview), "drag_begin",
@@ -5112,9 +5104,9 @@ static void dupe_dnd_init(DupeWindow *dw)
        g_signal_connect(G_OBJECT(dw->listview), "drag_data_received",
                         G_CALLBACK(dupe_dnd_data_get), dw);
 
-       gtk_drag_source_set(dw->second_listview, GDK_BUTTON1_MASK | GDK_BUTTON2_MASK,
+       gtk_drag_source_set(dw->second_listview, static_cast<GdkModifierType>(GDK_BUTTON1_MASK | GDK_BUTTON2_MASK),
                            dupe_drag_types, n_dupe_drag_types,
-                           GDK_ACTION_COPY | GDK_ACTION_MOVE | GDK_ACTION_LINK);
+                           static_cast<GdkDragAction>(GDK_ACTION_COPY | GDK_ACTION_MOVE | GDK_ACTION_LINK));
        g_signal_connect(G_OBJECT(dw->second_listview), "drag_data_get",
                         G_CALLBACK(dupe_dnd_data_set), dw);
        g_signal_connect(G_OBJECT(dw->second_listview), "drag_begin",
@@ -5135,7 +5127,7 @@ static void dupe_dnd_init(DupeWindow *dw)
 
 static void dupe_notify_cb(FileData *fd, NotifyType type, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
        if (!(type & NOTIFY_CHANGE) || !fd->change) return;
 
@@ -5164,14 +5156,14 @@ static void dupe_notify_cb(FileData *fd, NotifyType type, gpointer data)
  * @param success (ud->phase != UTILITY_PHASE_CANCEL) #file_util_dialog_run
  * @param dest_path Not used
  * @param data #DupeWindow
- * 
+ *
  * If the window is refreshed after each file of a large set is deleted,
  * the UI slows to an unacceptable level. The #FileUtilDoneFunc is used
  * to call this function once, when the entire delete operation is completed.
  */
-static void delete_finished_cb(gboolean success, const gchar *UNUSED(dest_path), gpointer data)
+static void delete_finished_cb(gboolean success, const gchar *, gpointer data)
 {
-       DupeWindow *dw = static_cast<DupeWindow *>(data);
+       auto dw = static_cast<DupeWindow *>(data);
 
        if (!success)
                {
@@ -5187,13 +5179,12 @@ static void delete_finished_cb(gboolean success, const gchar *UNUSED(dest_path),
  *-------------------------------------------------------------------
  */
 
- typedef enum {
+enum SeparatorType {
        EXPORT_CSV = 0,
        EXPORT_TSV
-} SeparatorType;
+};
 
-typedef struct _ExportDupesData ExportDupesData;
-struct _ExportDupesData
+struct ExportDupesData
 {
        FileDialog *dialog;
        SeparatorType separator;
@@ -5203,27 +5194,26 @@ struct _ExportDupesData
 static void export_duplicates_close(ExportDupesData *edd)
 {
        if (edd->dialog) file_dialog_close(edd->dialog);
-       edd->dialog = NULL;
+       edd->dialog = nullptr;
 }
 
-static void export_duplicates_data_cancel_cb(FileDialog *UNUSED(fdlg), gpointer data)
+static void export_duplicates_data_cancel_cb(FileDialog *, gpointer data)
 {
-       ExportDupesData *edd = static_cast<ExportDupesData *>(data);
+       auto edd = static_cast<ExportDupesData *>(data);
 
        export_duplicates_close(edd);
 }
 
 static void export_duplicates_data_save_cb(FileDialog *fdlg, gpointer data)
 {
-       ExportDupesData *edd = static_cast<ExportDupesData *>(data);
-       GError *error = NULL;
+       auto edd = static_cast<ExportDupesData *>(data);
+       GError *error = nullptr;
        GtkTreeModel *store;
        GtkTreeIter iter;
        DupeItem *di;
        GFileOutputStream *gfstream;
        GFile *out_file;
        GString *output_string;
-       gchar *sep;
        gchar* rank;
        GList *work;
        GtkTreeSelection *selection;
@@ -5240,7 +5230,7 @@ static void export_duplicates_data_save_cb(FileDialog *fdlg, gpointer data)
 
        out_file = g_file_new_for_path(fdlg->dest_path);
 
-       gfstream = g_file_replace(out_file, NULL, TRUE, G_FILE_CREATE_NONE, NULL, &error);
+       gfstream = g_file_replace(out_file, nullptr, TRUE, G_FILE_CREATE_NONE, nullptr, &error);
        if (error)
                {
                log_printf(_("Error creating Export duplicates data file: Error: %s\n"), error->message);
@@ -5248,7 +5238,7 @@ static void export_duplicates_data_save_cb(FileDialog *fdlg, gpointer data)
                return;
                }
 
-       sep = g_strdup((edd->separator == EXPORT_CSV) ?  "," : "\t");
+       const gchar *sep = (edd->separator == EXPORT_CSV) ?  "," : "\t";
        output_string = g_string_new(g_strjoin(sep, _("Match"), _("Group"), _("Similarity"), _("Set"), _("Thumbnail"), _("Name"), _("Size"), _("Date"), _("Width"), _("Height"), _("Path\n"), NULL));
 
        selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(edd->dupewindow->listview));
@@ -5274,7 +5264,7 @@ static void export_duplicates_data_save_cb(FileDialog *fdlg, gpointer data)
                        match_count++;
                        }
                color_old = color_new;
-               output_string = g_string_append(output_string, g_strdup_printf("%d", match_count));
+               g_string_append_printf(output_string, "%d", match_count);
                output_string = g_string_append(output_string, sep);
 
                if ((dupe_match_find_parent(edd->dupewindow, di) == di))
@@ -5289,19 +5279,19 @@ static void export_duplicates_data_save_cb(FileDialog *fdlg, gpointer data)
 
                gtk_tree_model_get(GTK_TREE_MODEL(store), &iter, DUPE_COLUMN_RANK, &rank, -1);
                rank_split = g_strsplit_set(rank, " [(", -1);
-               if (rank_split[0] == NULL)
+               if (rank_split[0] == nullptr)
                        {
                        output_string = g_string_append(output_string, "");
                        }
                else
                        {
-                       output_string = g_string_append(output_string, g_strdup_printf("%s", rank_split[0]));
+                       output_string = g_string_append(output_string, rank_split[0]);
                        }
                output_string = g_string_append(output_string, sep);
                g_free(rank);
                g_strfreev(rank_split);
 
-               output_string = g_string_append(output_string, g_strdup_printf("%d", (di->second + 1)));
+               g_string_append_printf(output_string, "%d", di->second + 1);
                output_string = g_string_append(output_string, sep);
 
                thumb_cache = cache_find_location(CACHE_TYPE_THUMB, di->fd->path);
@@ -5321,13 +5311,13 @@ static void export_duplicates_data_save_cb(FileDialog *fdlg, gpointer data)
                output_string = g_string_append(output_string, sep);
                g_free(name);
 
-               output_string = g_string_append(output_string, g_strdup_printf("%"PRIu64, di->fd->size));
+               g_string_append_printf(output_string, "%" PRIu64, di->fd->size);
                output_string = g_string_append(output_string, sep);
                output_string = g_string_append(output_string, text_from_time(di->fd->date));
                output_string = g_string_append(output_string, sep);
-               output_string = g_string_append(output_string, g_strdup_printf("%d", (di->width ? di->width : 0)));
+               g_string_append_printf(output_string, "%d", di->width);
                output_string = g_string_append(output_string, sep);
-               output_string = g_string_append(output_string, g_strdup_printf("%d", (di->height ? di->height : 0)));
+               g_string_append_printf(output_string, "%d", di->height);
                output_string = g_string_append(output_string, sep);
                output_string = g_string_append(output_string, di->fd->path);
                output_string = g_string_append_c(output_string, '\n');
@@ -5335,9 +5325,8 @@ static void export_duplicates_data_save_cb(FileDialog *fdlg, gpointer data)
                work = work->next;
                }
 
-       g_output_stream_write(G_OUTPUT_STREAM(gfstream), output_string->str, strlen(output_string->str), NULL, &error);
+       g_output_stream_write(G_OUTPUT_STREAM(gfstream), output_string->str, output_string->len, nullptr, &error);
 
-       g_free(sep);
        g_string_free(output_string, TRUE);
        g_object_unref(gfstream);
        g_object_unref(out_file);
@@ -5345,19 +5334,18 @@ static void export_duplicates_data_save_cb(FileDialog *fdlg, gpointer data)
        export_duplicates_close(edd);
 }
 
-static void pop_menu_export(GList *UNUSED(selection_list), gpointer dupe_window, gpointer data)
+static void pop_menu_export(GList *, gpointer dupe_window, gpointer data)
 {
        const gint index = GPOINTER_TO_INT(data);
-       DupeWindow *dw = static_cast<DupeWindow *>(dupe_window);
-       gchar *title = "Export duplicates data";
-       gchar *default_path = "/tmp/";
+       auto dw = static_cast<DupeWindow *>(dupe_window);
+       const gchar *title = _("Export duplicates data");
+       const gchar *default_path = "/tmp/";
        gchar *file_extension;
-       const gchar *stock_id;
        ExportDupesData *edd;
        const gchar *previous_path;
 
        edd = g_new0(ExportDupesData, 1);
-       edd->dialog = file_util_file_dlg(title, "export_duplicates", NULL, export_duplicates_data_cancel_cb, edd);
+       edd->dialog = file_util_file_dlg(title, "export_duplicates", nullptr, export_duplicates_data_cancel_cb, edd);
 
        switch (index)
                {
@@ -5373,10 +5361,8 @@ static void pop_menu_export(GList *UNUSED(selection_list), gpointer dupe_window,
                        return;
                }
 
-       stock_id = GTK_STOCK_SAVE;
-
-       generic_dialog_add_message(GENERIC_DIALOG(edd->dialog), NULL, title, NULL, FALSE);
-       file_dialog_add_button(edd->dialog, stock_id, NULL, export_duplicates_data_save_cb, TRUE);
+       generic_dialog_add_message(GENERIC_DIALOG(edd->dialog), nullptr, title, nullptr, FALSE);
+       file_dialog_add_button(edd->dialog, GQ_ICON_SAVE, _("Save"), export_duplicates_data_save_cb, TRUE);
 
        previous_path = history_list_find_last_path_by_key("export_duplicates");
 
@@ -5406,15 +5392,15 @@ static GtkWidget *submenu_add_export(GtkWidget *menu, GtkWidget **menu_item, GCa
        GtkWidget *item;
        GtkWidget *submenu;
 
-       item = menu_item_add(menu, _("_Export"), NULL, NULL);
+       item = menu_item_add(menu, _("_Export"), nullptr, nullptr);
 
        submenu = gtk_menu_new();
        g_object_set_data(G_OBJECT(submenu), "submenu_data", data);
 
-       menu_item_add_stock_sensitive(submenu, _("Export to csv"),
-                                       GTK_STOCK_INDEX, TRUE, G_CALLBACK(func), GINT_TO_POINTER(0));
-       menu_item_add_stock_sensitive(submenu, _("Export to tab-delimited"),
-                                       GTK_STOCK_INDEX, TRUE, G_CALLBACK(func), GINT_TO_POINTER(1));
+       menu_item_add_icon_sensitive(submenu, _("Export to csv"),
+                                       GQ_ICON_EXPORT, TRUE, G_CALLBACK(func), GINT_TO_POINTER(0));
+       menu_item_add_icon_sensitive(submenu, _("Export to tab-delimited"),
+                                       GQ_ICON_EXPORT, TRUE, G_CALLBACK(func), GINT_TO_POINTER(1));
 
        gtk_menu_item_set_submenu(GTK_MENU_ITEM(item), submenu);
        if (menu_item) *menu_item = item;