If the "Create Folder" button in the save dialog is hit while GIMP is busy
reading the contents of a large directory, then the new, unnamed folder appears
in the file list while the focus goes essentially nowhere. It *looks* like the
filename input is in focus, but typing does nothing. It is necessary to
double-click on the unnamed folder to actually type the name of it in.

The following error is also printed to stdout:

(gimp:6278): Gtk-CRITICAL **: gtk_tree_view_scroll_to_cell: assertion
`tree_view->priv->model != NULL' failed

(gimp:6278): Gtk-CRITICAL **: gtk_tree_row_reference_new_proxy: assertion
`GTK_IS_TREE_MODEL (model)' failed