file chooser: Stay focused

When hitting Escape in the location entry,
we were not moving the focus anywhere,
causing focus to be NULL, and key bindings
to stop working. The visible effect was
that Ctrl-L / Escape / Ctrl-L would not
get back to the location entry, as expected.

Closes: https://gitlab.gnome.org/GNOME/gtk/issues/1851

gtk/gtkfilechooserwidget.c

@@ -2482,6 +2482,7 @@ static void
 location_entry_close_clicked (GtkFileChooserWidget *impl)
 {
   location_mode_set (impl, LOCATION_MODE_PATH_BAR);
+  gtk_widget_grab_focus (GTK_WIDGET (impl));
 }
 
 static void