%TRUE to stop other handlers from being invoked for the event and to cancel the emission of the second specific ::event signal. %FALSE to propagate the event further and to allow the emission of the second signal. The ::event-after signal is emitted regardless of the return value.
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The GTK+ main loop will emit three signals for each GDK event delivered to a widget: one generic ::event signal, another, more specific, signal that matches the type of event delivered (e.g. #GtkWidget::key-press-event) and finally a generic #GtkWidget::event-after signal.