The leave_notify_event will be emitted when the pointer leaves the widget's window.
To receive this signal, the Window associated to the widget needs to enable the LEAVE_NOTIFY_MASK mask.
This signal will be sent to the grab widget if there is one.
| event |
the EventCrossing which triggered this signal. |
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true to stop other handlers from being invoked for the event. false to propagate the event further. |