The ::visibility-notify-event will be emitted when the widget's window is obscured or unobscured. To receive this signal the GdkWindow associated to the widget needs to enable the GDK_VISIBILITY_NOTIFY_MASK mask.
See Implementation
The ::visibility-notify-event will be emitted when the widget's window is obscured or unobscured. To receive this signal the GdkWindow associated to the widget needs to enable the GDK_VISIBILITY_NOTIFY_MASK mask.