Adds an event filter to window, allowing you to intercept events
before they reach GDK. This is a low-level operation and makes it
easy to break GDK and/or GTK+, so you have to know what you're
doing. Pass NULL for window to get all events for all windows,
instead of events for a specific window.
See gdk_display_add_client_message_filter() if you are interested
in X ClientMessage events.
Adds an event filter to window, allowing you to intercept events before they reach GDK. This is a low-level operation and makes it easy to break GDK and/or GTK+, so you have to know what you're doing. Pass NULL for window to get all events for all windows, instead of events for a specific window. See gdk_display_add_client_message_filter() if you are interested in X ClientMessage events.