Fix the "continuous display" of tooltips in the collection view

Fix the "continuous display" of tooltips in the collection view
(before the tooltip delay occured once, then changing icon to icon never hide the
tooltip again, now the tip is displayed shortly after the cursor moved on the icon,
but disappears when moving cursor to another icon).

Display the full path to the file when Show filename text is on (before nothing
was displayed).

When Show filename text is off, behavior is unchanged, the (short) filename is
displayed.