Revert "Remove onScroll bubbling flag (facebook#19535)" (facebook#19655)

This reverts commit e9721e1.

Author: gaearon

packages/react-dom/src/__tests__/ReactDOMEventListener-test.js

@@ -712,12 +712,23 @@ describe('ReactDOMEventListener', () => {
           bubbles: false,
         }),
       );
-      expect(log).toEqual([
-        ['capture', 'grand'],
-        ['capture', 'parent'],
-        ['capture', 'child'],
-        ['bubble', 'child'],
-      ]);
+      if (gate(flags => flags.disableOnScrollBubbling)) {
+        expect(log).toEqual([
+          ['capture', 'grand'],
+          ['capture', 'parent'],
+          ['capture', 'child'],
+          ['bubble', 'child'],
+        ]);
+      } else {
+        expect(log).toEqual([
+          ['capture', 'grand'],
+          ['capture', 'parent'],
+          ['capture', 'child'],
+          ['bubble', 'child'],
+          ['bubble', 'parent'],
+          ['bubble', 'grand'],
+        ]);
+      }
     } finally {
       document.body.removeChild(container);
     }

packages/react-dom/src/__tests__/ReactDOMEventPropagation-test.js

@@ -1225,6 +1225,12 @@ describe('ReactDOMEventListener', () => {
   });
 
   describe('non-bubbling events that do not bubble in React', () => {
+    // This test will fail outside of the no-bubbling flag
+    // because its bubbling emulation is currently broken.
+    // In particular, if the target itself doesn't have
+    // a handler, it will not emulate bubbling correctly.
+    // Instead of fixing this, we'll just turn this flag on.
+    // @gate disableOnScrollBubbling
     it('onScroll', () => {
       testNonBubblingEvent({
         type: 'div',

packages/react-dom/src/events/plugins/SimpleEventPlugin.js

@@ -47,7 +47,10 @@ import {IS_EVENT_HANDLE_NON_MANAGED_NODE} from '../EventSystemFlags';
 import getEventCharCode from '../getEventCharCode';
 import {IS_CAPTURE_PHASE} from '../EventSystemFlags';
 
-import {enableCreateEventHandleAPI} from 'shared/ReactFeatureFlags';
+import {
+  enableCreateEventHandleAPI,
+  disableOnScrollBubbling,
+} from 'shared/ReactFeatureFlags';
 
 function extractEvents(
   dispatchQueue: DispatchQueue,
@@ -182,13 +185,15 @@ function extractEvents(
     // In the past, React has always bubbled them, but this can be surprising.
     // We're going to try aligning closer to the browser behavior by not bubbling
     // them in React either. We'll start by not bubbling onScroll, and then expand.
-    const accumulateTargetOnly =
-      !inCapturePhase &&
-      // TODO: ideally, we'd eventually add all events from
-      // nonDelegatedEvents list in DOMPluginEventSystem.
-      // Then we can remove this special list.
-      // This is a breaking change that can wait until React 18.
-      domEventName === 'scroll';
+    let accumulateTargetOnly = false;
+    if (disableOnScrollBubbling) {
+      accumulateTargetOnly =
+        !inCapturePhase &&
+        // TODO: ideally, we'd eventually add all events from
+        // nonDelegatedEvents list in DOMPluginEventSystem.
+        // Then we can remove this special list.
+        domEventName === 'scroll';
+    }
 
     accumulateSinglePhaseListeners(
       targetInst,

packages/shared/ReactFeatureFlags.js

@@ -135,3 +135,4 @@ export const enableDiscreteEventFlushingChange = false;
 
 // https://github.com/facebook/react/pull/19654
 export const enablePassiveEventIntervention = true;
+export const disableOnScrollBubbling = true;

packages/shared/forks/ReactFeatureFlags.native-fb.js

@@ -44,6 +44,7 @@ export const enableComponentStackLocations = false;
 export const enableLegacyFBSupport = false;
 export const enableFilterEmptyStringAttributesDOM = false;
 export const skipUnmountedBoundaries = false;
+export const disableOnScrollBubbling = true;
 
 export const enableNewReconciler = false;
 export const deferRenderPhaseUpdateToNextBatch = true;

packages/shared/forks/ReactFeatureFlags.native-oss.js

@@ -43,6 +43,7 @@ export const enableComponentStackLocations = false;
 export const enableLegacyFBSupport = false;
 export const enableFilterEmptyStringAttributesDOM = false;
 export const skipUnmountedBoundaries = false;
+export const disableOnScrollBubbling = true;
 
 export const enableNewReconciler = false;
 export const deferRenderPhaseUpdateToNextBatch = true;

packages/shared/forks/ReactFeatureFlags.test-renderer.js

@@ -43,6 +43,7 @@ export const enableComponentStackLocations = true;
 export const enableLegacyFBSupport = false;
 export const enableFilterEmptyStringAttributesDOM = false;
 export const skipUnmountedBoundaries = false;
+export const disableOnScrollBubbling = true;
 
 export const enableNewReconciler = false;
 export const deferRenderPhaseUpdateToNextBatch = true;

packages/shared/forks/ReactFeatureFlags.test-renderer.www.js

@@ -43,6 +43,7 @@ export const enableComponentStackLocations = true;
 export const enableLegacyFBSupport = false;
 export const enableFilterEmptyStringAttributesDOM = false;
 export const skipUnmountedBoundaries = false;
+export const disableOnScrollBubbling = true;
 
 export const enableNewReconciler = false;
 export const deferRenderPhaseUpdateToNextBatch = true;

packages/shared/forks/ReactFeatureFlags.testing.js

@@ -43,6 +43,7 @@ export const enableComponentStackLocations = true;
 export const enableLegacyFBSupport = false;
 export const enableFilterEmptyStringAttributesDOM = false;
 export const skipUnmountedBoundaries = false;
+export const disableOnScrollBubbling = true;
 
 export const enableNewReconciler = false;
 export const deferRenderPhaseUpdateToNextBatch = true;

packages/shared/forks/ReactFeatureFlags.testing.www.js

@@ -43,6 +43,7 @@ export const enableComponentStackLocations = true;
 export const enableLegacyFBSupport = !__EXPERIMENTAL__;
 export const enableFilterEmptyStringAttributesDOM = false;
 export const skipUnmountedBoundaries = __EXPERIMENTAL__;
+export const disableOnScrollBubbling = true;
 
 export const enableNewReconciler = false;
 export const deferRenderPhaseUpdateToNextBatch = true;