Part fix #711: Deleting image should not scroll file list unnecessarily

Part fix #711: Deleting image should not scroll file list unnecessarily

https://github.com/BestImageViewer/geeqie/issues/711

This fix still has the following problems:
1. The refresh scrolls the list so that the first thumbnail is
completely aligned in the view
2. Sometimes the first alignment is followed by a second
3. If a selection list is deleted, the thumb with focus is not brought
into the view area
4. If an image in the last row is deleted, sometimes the remaining last
row is not brought completely into the view