GitLab

Compress the events by emitting a single event if the parent is the
same.

(cherry picked from commit 64d92988)

This only happened when selecting images with a range select
(shift + mouse click) after deleting the last images in a list.

The last_selected_pos value was not updated after deleting or adding
files to the list.

Closes #126

This allows to use the same shortcuts wherever the widget is used, for
example in the import dialog as well.  However now the shortcuts for
these commands are no longer editable.

With certain malformed jpegs the call to jpeg_finish_decompress
caused a long jump back to stop_loading. This jump overwrote the
value of the surface pointer which should be NULL which in turn 
caused a cairo assert when trying to get a reference to a surface
with ref_count = 0.

Also moved the cleanup of in_buffer out of the !finished scope, 
as it seems this would otherwise be a potential leak.