filechooser: Ctrl+L, Escape, Ctrl+L does not show the location entry again

I suppose the reason is that the previously focused search entry is now unmapped and does not receive key events anymore, so ctrl+l doesn't even reach the file chooser widget.

1. Open the filechooser via the filechooser button in the widget-factory page 1
2. Press Ctrl+l. The location entry appears
3. Press Escape.
4. Press Ctrl+L again. Nothing happens.