Blender Git Commit Log

FileBrowser Bookmarks: fix issue with invalid bookmarks.

Reported by maxon through IRC, thanks.

Invalid (inexistant) bookmarks would not be selectable, hence not removable.

First, made invalid bookmarks grayed out in lists, so that user knows when there are some.

Then, added a new 'cleanup' operator that removes all invalid bookmarks.

This solution may not be completely satisfaying, but should do the work for now.
I do not want to add back those ugly 'X' delete buttons for each entry in list,
so better solution would be to make UIList able to select several items at once...