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Browsers dispatch mouse events after touch events: https://developer.mozilla.org/en-US/docs/Web/API/Touch_events/Supporting_both_TouchEvent_and_MouseEvent There have been several attempts to avoid this behaviour affecting the ResponderEvent system. The previous approach of cancelling the event in the `onResponderRelease` event handler can end up cancelling other events that are expected, e.g., `focus`. Instead, this patch changes the `ResponderEventPlugin.extractEvents` function to filter the mouse events that occur a short time after a touch event. (It's assumed that people will not be clicking a mouse within a few hundred ms of performing a touch.) This allows the ResponderEvent system to function as expected and leaves other callbacks to fire as they would be expected to in React DOM, i.e., both `onTouchStart` and `onMouseDown` will be called following a touch start. Fix #835 Fix #888 Fix #932 Close #938 Ref #802