The button_release_event signal will be emitted when a button (typically from a mouse) is released.
To receive this signal, the Window associated to the widget needs to enable the BUTTON_RELEASE_MASK mask.
This signal will be sent to the grab widget if there is one.
| event |
the EventButton 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. |