Remove `clipChildRectsIfOverflowIsHidden` feature flag and associated code

Summary:
The flag `clipChildRectsIfOverflowIsHidden` has been set to false for a little over a year. Delete it and associated callsites.

Changelog: [Internal]

Reviewed By: mdvacca

Differential Revision: D25451696

fbshipit-source-id: a6067b2e25124f6bdef336c2ddead719dd44cca9

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

@@ -53,18 +53,6 @@ public class ReactFeatureFlags {
    */
   public static boolean useViewManagerDelegatesForCommands = false;
 
-  /**
-   * This react flag enables a custom algorithm for the getChildVisibleRect() method in the classes
-   * ReactViewGroup, ReactHorizontalScrollView and ReactScrollView.
-   *
-   * <p>This new algorithm clip child rects if overflow is set to ViewProps.HIDDEN. More details in
-   * https://github.com/facebook/react-native/issues/23870 and
-   * https://github.com/facebook/react-native/pull/26334
-   *
-   * <p>The react flag is disabled by default because this is increasing ANRs (T57363204)
-   */
-  public static boolean clipChildRectsIfOverflowIsHidden = false;
-
   /**
    * Temporary feature flat to control a fix in the transition to layoutOnlyViews TODO T61185028:
    * remove this when bug is fixed

ReactAndroid/src/main/java/com/facebook/react/uimanager/ReactClippingViewGroupHelper.java

@@ -8,7 +8,6 @@
 package com.facebook.react.uimanager;
 
 import android.graphics.Rect;
-import android.graphics.RectF;
 import android.view.View;
 import android.view.ViewParent;
 import javax.annotation.concurrent.NotThreadSafe;
@@ -57,51 +56,4 @@ public class ReactClippingViewGroupHelper {
     }
     view.getDrawingRect(outputRect);
   }
-
-  public static boolean getChildVisibleRectHelper(
-      View child, Rect r, android.graphics.Point offset, View parent, String overflow) {
-    // This is based on the Android ViewGroup implementation, modified to clip child rects
-    // if overflow is set to ViewProps.HIDDEN. This effectively solves Issue #23870 which
-    // appears to have been introduced by FLAG_CLIP_CHILDREN being forced false
-    // regardless of whether clipping is desired.
-    final RectF rect = new RectF();
-    rect.set(r);
-
-    child.getMatrix().mapRect(rect);
-
-    final int dx = child.getLeft() - parent.getScrollX();
-    final int dy = child.getTop() - parent.getScrollY();
-
-    rect.offset(dx, dy);
-
-    if (offset != null) {
-      float[] position = new float[2];
-      position[0] = offset.x;
-      position[1] = offset.y;
-      child.getMatrix().mapPoints(position);
-      offset.x = Math.round(position[0]) + dx;
-      offset.y = Math.round(position[1]) + dy;
-    }
-
-    final int width = parent.getRight() - parent.getLeft();
-    final int height = parent.getBottom() - parent.getTop();
-
-    boolean rectIsVisible = true;
-
-    ViewParent grandparent = parent.getParent();
-    if (grandparent == null || ViewProps.HIDDEN.equals(overflow)) {
-      rectIsVisible = rect.intersect(0, 0, width, height);
-    }
-
-    r.set(
-        (int) Math.floor(rect.left),
-        (int) Math.floor(rect.top),
-        (int) Math.ceil(rect.right),
-        (int) Math.ceil(rect.bottom));
-
-    if (rectIsVisible && grandparent != null) {
-      rectIsVisible = grandparent.getChildVisibleRect(parent, r, offset);
-    }
-    return rectIsVisible;
-  }
 }

ReactAndroid/src/main/java/com/facebook/react/views/scroll/ReactHorizontalScrollView.java

@@ -34,7 +34,6 @@ import com.facebook.infer.annotation.Assertions;
 import com.facebook.react.bridge.WritableMap;
 import com.facebook.react.bridge.WritableNativeMap;
 import com.facebook.react.common.ReactConstants;
-import com.facebook.react.config.ReactFeatureFlags;
 import com.facebook.react.uimanager.FabricViewStateManager;
 import com.facebook.react.uimanager.MeasureSpecAssertions;
 import com.facebook.react.uimanager.PixelUtil;
@@ -546,9 +545,7 @@ public class ReactHorizontalScrollView extends HorizontalScrollView
 
   @Override
   public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) {
-    return ReactFeatureFlags.clipChildRectsIfOverflowIsHidden
-        ? ReactClippingViewGroupHelper.getChildVisibleRectHelper(child, r, offset, this, mOverflow)
-        : super.getChildVisibleRect(child, r, offset);
+    return super.getChildVisibleRect(child, r, offset);
   }
 
   private int getSnapInterval() {

ReactAndroid/src/main/java/com/facebook/react/views/scroll/ReactScrollView.java

@@ -30,7 +30,6 @@ import com.facebook.react.bridge.ReactContext;
 import com.facebook.react.bridge.WritableMap;
 import com.facebook.react.bridge.WritableNativeMap;
 import com.facebook.react.common.ReactConstants;
-import com.facebook.react.config.ReactFeatureFlags;
 import com.facebook.react.uimanager.FabricViewStateManager;
 import com.facebook.react.uimanager.MeasureSpecAssertions;
 import com.facebook.react.uimanager.PixelUtil;
@@ -383,9 +382,7 @@ public class ReactScrollView extends ScrollView
 
   @Override
   public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) {
-    return ReactFeatureFlags.clipChildRectsIfOverflowIsHidden
-        ? ReactClippingViewGroupHelper.getChildVisibleRectHelper(child, r, offset, this, mOverflow)
-        : super.getChildVisibleRect(child, r, offset);
+    return super.getChildVisibleRect(child, r, offset);
   }
 
   @Override

ReactAndroid/src/main/java/com/facebook/react/views/view/ReactViewGroup.java

@@ -31,7 +31,6 @@ import com.facebook.infer.annotation.Assertions;
 import com.facebook.react.bridge.ReactContext;
 import com.facebook.react.bridge.UiThreadUtil;
 import com.facebook.react.common.annotations.VisibleForTesting;
-import com.facebook.react.config.ReactFeatureFlags;
 import com.facebook.react.modules.i18nmanager.I18nUtil;
 import com.facebook.react.touch.OnInterceptTouchEventListener;
 import com.facebook.react.touch.ReactHitSlopView;
@@ -419,9 +418,7 @@ public class ReactViewGroup extends ViewGroup
 
   @Override
   public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) {
-    return ReactFeatureFlags.clipChildRectsIfOverflowIsHidden
-        ? ReactClippingViewGroupHelper.getChildVisibleRectHelper(child, r, offset, this, mOverflow)
-        : super.getChildVisibleRect(child, r, offset);
+    return super.getChildVisibleRect(child, r, offset);
   }
 
   @Override