Fix TextInput breaking nested scroll gestures on Android

Summary:
Fixes an Android-only bug where TextInputs can interfere with nested scroll gestures, causing scroll events to be performed on the outer parent instead of the inner ScrollView.

### Root Cause

This issue occurs when you have a TextInput inside an inner ScrollView with `nestedScrollEnabled = true` inside an outer ScrollView. When a scroll gesture is performed on a TextInput that can scroll, the TextInput intercepts the gesture as expected. However, the next scroll gesture applied anywhere in the inner ScrollView scrolls the outer parent instead of the inner ScrollView.

`inner.onInterceptTouchEvent()` calls `startNestedScroll()` on ACTION_DOWN and `stopNestedScroll()` on ACTION_UP. When the scroll gesture is on a scrollable TextInput, ReactEditText disallows parent views from intercepting touch events. This means on ACTION_UP, `inner.onInterceptTouchEvent()` and `stopNestedScroll()` is not triggered.

Without `stopNestedScroll()`, the subsequent `startNestedScroll()` on the next ACTION_DOWN becomes a no-op, and the outer ScrollView intercepts the scroll gesture instead of the inner ScrollView.

### This PR

Add a defensive `stopNestedScroll()` in `dispatchTouchEvent()` for ScrollViews. This matches the existing pattern already used by Android in `View.dispatchTouchEvent()` which includes the exact same defensive cleanup.

Changelog: [Android][Fixed] Prevent TextInputs from interfering with nested scroll gestures

Differential Revision: D122404118

Author: jasozh

packages/react-native/ReactAndroid/api/ReactAndroid.api

@@ -5476,6 +5476,7 @@ public class com/facebook/react/views/scroll/ReactHorizontalScrollView : android
 	public fun arrowScroll (I)Z
 	public fun canScrollHorizontally (I)Z
 	public fun dispatchGenericMotionEvent (Landroid/view/MotionEvent;)Z
+	public fun dispatchTouchEvent (Landroid/view/MotionEvent;)Z
 	public fun draw (Landroid/graphics/Canvas;)V
 	public fun executeKeyEvent (Landroid/view/KeyEvent;)Z
 	public fun flashScrollIndicators ()V
@@ -5624,6 +5625,7 @@ public class com/facebook/react/views/scroll/ReactScrollView : android/widget/Sc
 	public synthetic fun <init> (Landroid/content/Context;Lcom/facebook/react/views/scroll/FpsListener;ILkotlin/jvm/internal/DefaultConstructorMarker;)V
 	public fun abortAnimation ()V
 	public fun dispatchGenericMotionEvent (Landroid/view/MotionEvent;)Z
+	public fun dispatchTouchEvent (Landroid/view/MotionEvent;)Z
 	public fun draw (Landroid/graphics/Canvas;)V
 	public fun executeKeyEvent (Landroid/view/KeyEvent;)Z
 	public fun flashScrollIndicators ()V

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/views/scroll/ReactHorizontalScrollView.kt

@@ -645,6 +645,14 @@ constructor(context: Context, private val fpsListener: FpsListener? = null) :
   override fun shouldDelayChildPressedState(): Boolean =
       hasChildPressedStateDelay ?: super.shouldDelayChildPressedState()
 
+  override fun dispatchTouchEvent(ev: MotionEvent): Boolean {
+    if (ev.actionMasked == MotionEvent.ACTION_DOWN) {
+      // Defensive cleanup for new gesture
+      stopNestedScroll()
+    }
+    return super.dispatchTouchEvent(ev)
+  }
+
   override fun onInterceptTouchEvent(ev: MotionEvent): Boolean {
     if (!scrollEnabled) return false
 

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/views/scroll/ReactNestedScrollView.kt

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<2f9a2ea0c223b08d9d1ea4517fd9671b>>
+ * @generated SignedSource<<a32e8eb823c728bdb2200b163b82efe3>>
  */
 
 /**
@@ -565,6 +565,14 @@ constructor(context: Context, private val fpsListener: FpsListener? = null) :
   override fun shouldDelayChildPressedState(): Boolean =
       hasChildPressedStateDelay ?: super.shouldDelayChildPressedState()
 
+  override fun dispatchTouchEvent(ev: MotionEvent): Boolean {
+    if (ev.actionMasked == MotionEvent.ACTION_DOWN) {
+      // Defensive cleanup for new gesture
+      stopNestedScroll()
+    }
+    return super.dispatchTouchEvent(ev)
+  }
+
   override fun onInterceptTouchEvent(ev: MotionEvent): Boolean {
     if (!scrollEnabled) return false
     if (!PointerEvents.canChildrenBeTouchTarget(pointerEvents)) return true

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/views/scroll/ReactNestedScrollViewManager.kt

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @generated SignedSource<<3b339a7d81f8e32cf6b6ca93ae9a388b>>
+ * @generated SignedSource<<acbc1716191446a5c496c66dfa368b52>>
  */
 
 /**
@@ -461,15 +461,17 @@ constructor(private val fpsListener: FpsListener? = null) :
   companion object {
     const val REACT_CLASS: String = "RCTScrollView"
 
-    fun createExportedCustomDirectEventTypeConstants(): Map<String, Any> = mapOf(
-        getJSEventName(ScrollEventType.SCROLL) to mapOf("registrationName" to "onScroll"),
-        getJSEventName(ScrollEventType.BEGIN_DRAG) to
-            mapOf("registrationName" to "onScrollBeginDrag"),
-        getJSEventName(ScrollEventType.END_DRAG) to mapOf("registrationName" to "onScrollEndDrag"),
-        getJSEventName(ScrollEventType.MOMENTUM_BEGIN) to
-            mapOf("registrationName" to "onMomentumScrollBegin"),
-        getJSEventName(ScrollEventType.MOMENTUM_END) to
-            mapOf("registrationName" to "onMomentumScrollEnd"),
-    )
+    fun createExportedCustomDirectEventTypeConstants(): Map<String, Any> =
+        mapOf(
+            getJSEventName(ScrollEventType.SCROLL) to mapOf("registrationName" to "onScroll"),
+            getJSEventName(ScrollEventType.BEGIN_DRAG) to
+                mapOf("registrationName" to "onScrollBeginDrag"),
+            getJSEventName(ScrollEventType.END_DRAG) to
+                mapOf("registrationName" to "onScrollEndDrag"),
+            getJSEventName(ScrollEventType.MOMENTUM_BEGIN) to
+                mapOf("registrationName" to "onMomentumScrollBegin"),
+            getJSEventName(ScrollEventType.MOMENTUM_END) to
+                mapOf("registrationName" to "onMomentumScrollEnd"),
+        )
   }
 }

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/views/scroll/ReactScrollView.kt

@@ -557,6 +557,14 @@ constructor(context: Context, private val fpsListener: FpsListener? = null) :
   override fun shouldDelayChildPressedState(): Boolean =
       hasChildPressedStateDelay ?: super.shouldDelayChildPressedState()
 
+  override fun dispatchTouchEvent(ev: MotionEvent): Boolean {
+    if (ev.actionMasked == MotionEvent.ACTION_DOWN) {
+      // Defensive cleanup for new gesture
+      stopNestedScroll()
+    }
+    return super.dispatchTouchEvent(ev)
+  }
+
   override fun onInterceptTouchEvent(ev: MotionEvent): Boolean {
     if (!scrollEnabled) return false
     if (!PointerEvents.canChildrenBeTouchTarget(pointerEvents)) return true