The ::focus-out-event signal will be emitted when the keyboard focus leaves the @widget's window.
To receive this signal, the #GdkWindow associated to the widget needs to enable the #GDK_FOCUS_CHANGE_MASK mask.
%TRUE to stop other handlers from being invoked for the event. %FALSE to propagate the event further.
See Implementation
The ::focus-out-event signal will be emitted when the keyboard focus leaves the @widget's window.
To receive this signal, the #GdkWindow associated to the widget needs to enable the #GDK_FOCUS_CHANGE_MASK mask.