The ::leave-notify-event will be emitted when the pointer leaves
the widget's window.
To receive this signal, the GdkWindow associated to the widget needs
to enable the GDK_LEAVE_NOTIFY_MASK mask.
This signal will be sent to the grab widget if there is one.
The ::leave-notify-event will be emitted when the pointer leaves the widget's window. To receive this signal, the GdkWindow associated to the widget needs to enable the GDK_LEAVE_NOTIFY_MASK mask. This signal will be sent to the grab widget if there is one.