Fix onPress event for nested Text in RN Android

Summary:
This bug is caused by RNAndroid dispatching an incorrect sequence of events to JS when the user taps on a Text.

Taking into consideration the example P462662009, when the user taps of the "Inner" text, RN Android is dispatching three events:
topTouchStart, topTouchStart and topTouchEnd.

The information stored on the first two JS events is correct, but the problem is that it is duplicated. This sequence of events makes Pressability to dispatch the event to the incorrect target.

This was originally introduced in D3035589 (39fdce2) (2016)

In this diff I'm changing the way RN Android bubbles events when the user taps on a ReactTextView. From now on, events won't be bubbled anymore, and they will be handled by the ReactRootView.onInterceptTouchEvent: https://fburl.com/code/rbt8$

Additionally, I'm creating a FeatureFlag in case this change has a unknown side effect that's only detected in production.
I will create a MC for FB4A in the next diffs of the stack

changelog: [Fixed][Android] Fix onPress event for nested Text in RN Android

Reviewed By: javache

Differential Revision: D31628461

fbshipit-source-id: 177397d4369191a3c97e2f86e801757b27ee5121

ReactAndroid/src/main/java/com/facebook/react/config/ReactFeatureFlags.java

@@ -105,4 +105,7 @@ public static boolean isMapBufferSerializationEnabled() {
   public static boolean useDispatchUniqueForCoalescableEvents = false;
 
   public static boolean useUpdatedTouchPreprocessing = false;
+
+  /** TODO: T103427072 Delete ReactFeatureFlags.enableNestedTextOnPressEventFix */
+  public static boolean enableNestedTextOnPressEventFix = true;
 }

ReactAndroid/src/main/java/com/facebook/react/views/text/ReactTextView.java

@@ -19,6 +19,7 @@
 import android.text.method.LinkMovementMethod;
 import android.text.util.Linkify;
 import android.view.Gravity;
+import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewGroup;
 import androidx.annotation.Nullable;
@@ -31,6 +32,7 @@
 import com.facebook.react.bridge.WritableArray;
 import com.facebook.react.bridge.WritableMap;
 import com.facebook.react.common.ReactConstants;
+import com.facebook.react.config.ReactFeatureFlags;
 import com.facebook.react.uimanager.PixelUtil;
 import com.facebook.react.uimanager.ReactCompoundView;
 import com.facebook.react.uimanager.UIManagerModule;
@@ -382,6 +384,16 @@ public int reactTagForTouch(float touchX, float touchY) {
     return target;
   }
 
+  @Override
+  public boolean onTouchEvent(MotionEvent ev) {
+    // The root view always assumes any view that was tapped wants the touch
+    // and sends the event to JS as such.
+    // We don't need to do bubbling in native (it's already happening in JS).
+    // For an explanation of bubbling and capturing, see
+    // http://javascript.info/tutorial/bubbling-and-capturing#capturing
+    return ReactFeatureFlags.enableNestedTextOnPressEventFix;
+  }
+
   @Override
   protected boolean verifyDrawable(Drawable drawable) {
     if (mContainsImages && getText() instanceof Spanned) {