[Flare] Fix Press retention state regression (#15936)

Author: trueadm

packages/react-events/src/Press.js

@@ -576,6 +576,7 @@ function updateIsPressWithinResponderRegion(
   props: PressProps,
   state: PressState,
 ): void {
+  let isPressWithinResponderRegion = true;
   if (
     state.pressTarget != null &&
     !context.isTargetWithinElement(target, state.pressTarget)
@@ -607,7 +608,7 @@ function updateIsPressWithinResponderRegion(
     }
     const {clientX: x, clientY: y} = (nativeEventOrTouchEvent: any);
 
-    state.isPressWithinResponderRegion =
+    isPressWithinResponderRegion =
       left != null &&
       right != null &&
       top != null &&
@@ -616,6 +617,7 @@ function updateIsPressWithinResponderRegion(
       y !== null &&
       (x >= left && x <= right && y >= top && y <= bottom);
   }
+  state.isPressWithinResponderRegion = isPressWithinResponderRegion;
 }
 
 const PressResponder = {

packages/react-events/src/__tests__/Press-test.internal.js

@@ -1049,6 +1049,55 @@ describe('Event responder: Press', () => {
         ]);
       });
 
+      it('no delay and "onPress*" events are correctly called with target change', () => {
+        let events = [];
+        const outerRef = React.createRef();
+        const innerRef = React.createRef();
+        const createEventHandler = msg => () => {
+          events.push(msg);
+        };
+
+        const element = (
+          <div ref={outerRef}>
+            <Press
+              onPress={createEventHandler('onPress')}
+              onPressChange={createEventHandler('onPressChange')}
+              onPressMove={createEventHandler('onPressMove')}
+              onPressStart={createEventHandler('onPressStart')}
+              onPressEnd={createEventHandler('onPressEnd')}>
+              <div ref={innerRef} />
+            </Press>
+          </div>
+        );
+
+        ReactDOM.render(element, container);
+
+        innerRef.current.getBoundingClientRect = getBoundingClientRectMock;
+        innerRef.current.dispatchEvent(createEvent('pointerdown'));
+        outerRef.current.dispatchEvent(
+          createEvent('pointermove', coordinatesOutside),
+        );
+        innerRef.current.dispatchEvent(
+          createEvent('pointermove', coordinatesInside),
+        );
+        innerRef.current.dispatchEvent(
+          createEvent('pointerup', coordinatesInside),
+        );
+        jest.runAllTimers();
+
+        expect(events).toEqual([
+          'onPressStart',
+          'onPressChange',
+          'onPressEnd',
+          'onPressChange',
+          'onPressStart',
+          'onPressChange',
+          'onPressEnd',
+          'onPressChange',
+          'onPress',
+        ]);
+      });
+
       it('delay and "onPressMove" is called before "onPress*" events', () => {
         let events = [];
         const ref = React.createRef();