GtkWindow::propagate_key_event

Passes keyevent off to the focus widget. If the focus widget does not handle the event, it will be passed to the focus widget's parent and will continue to move up the chain until either a widget handles the event or there are not more containers to pass the event off to.

This method is normally called automatically when a key is pressed in a top level window.

If the event is handled, this method returns true.