Created attachment 257613 [details]
Glade UI file demonstrating bug

If a file chooser dialog has a filter attached to it, file operations in the directory displayed in the file chooser can corrupt the list of displayed files, eventually causing a crash with this error:

Gtk:ERROR:gtkrbtree.c:465:_gtk_rbtree_insert_after: assertion failed: (_gtk_rbtree_is_nil (tree->root))

Sometimes the following nonfatal assertion can also be seen:

(glade:1694): Gtk-CRITICAL **: _gtk_rbtree_reorder: assertion 'tree->root->count == length' failed

To reproduce, load the attached file in Glade, then (in a separate terminal) repeatedly touch and rm a file which does _not_ match the file filter (in this case *.foo) in Glade's cwd.  In my case, the nonfatal assertion failure appears on the second "touch", and subsequently attempting to remove the filter from the dialog triggers the fatal assertion.  The file operations will also sometimes cause an unrelated entry to be removed from the file list.