Overridden to reset the internal state of the gesture recognizer when an attempt completes.
- macOS 10.10+
AppKit calls this method after the gesture recognizer state has been set to any of the terminal states:
NSGesture. Subclasses should override this method and use it to reset any internal state of the gesture recognizer in preparation for a new recognition attempt. After this method is called, the gesture recognizer receives no further updates for events that began but have not yet ended.