compute correct Keyboard Height with Notch (#30919)

Summary:
fixes https://github.com/facebook/react-native/issues/27089 fixes https://github.com/facebook/react-native/issues/30191 fixes https://github.com/facebook/react-native/issues/26296 fixes https://github.com/facebook/react-native/issues/24353
Related https://github.com/facebook/react-native/issues/30052 https://github.com/facebook/react-native/issues/28004 https://github.com/facebook/react-native/issues/26536

The keyboard height of event keyboardDidShow is computed as the difference of two variables:

- The screen height excluding the Android Notch
DisplayMetricsHolder.getWindowDisplayMetrics().heightPixels returns the screen height excluding the Android Notch
- The Visible Area excluding the Keyboard, but including the Android Notch
getWindowVisibleDisplayFrame() which returns the visible area including the Android Notch

The computation of the keyboard height is wrong when the device has an Android Notch.
This pr adds the Android Notch computation for API levels 28+

More info at https://github.com/facebook/react-native/issues/27089#issuecomment-775821333

## Changelog

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[Android] [Fixed] - Compute Android Notch in keyboardDidShow height calculation API 28+

Pull Request resolved: https://github.com/facebook/react-native/pull/30919

Test Plan:
adding a ReactRootViewTest for keyboardDidShow verifying correct functionality on API < 28

**<details><summary>TEST CASE - BEFORE FIX</summary>**
<p>

**WITHOUT NOTCH**
- The black view on the bottom is visible
- The keyboard height is 282

| **Full Screen** | **Keyboard Did Show** |
|:-------------------------:|:-------------------------:|
| <img src="https://user-images.githubusercontent.com/24992535/107212700-a1fd9d00-6a07-11eb-9248-26f9c4d92ae3.png" width="300" height="" /> | <img src="https://user-images.githubusercontent.com/24992535/107212590-7975a300-6a07-11eb-89f4-891a37a7c406.png"  width="300" height="" /> |

**WITH NOTCH**
- The black view on the bottom is **not** visible. The black view is not visible because keyboardDidHide is sending the wrong keyboard height value.
- The keyboard height changes to 234. The keyboard height is the same from the previous test, but the value sent from keyboardDidHide changed for the Notch.

| **Full Screen** | **Keyboard Did Show** |
|:-------------------------:|:-------------------------:|
| <img src="https://user-images.githubusercontent.com/24992535/107212619-81cdde00-6a07-11eb-9630-7e7c8c34d798.png" width="300" height="" /> | <img src="https://user-images.githubusercontent.com/24992535/107212707-a4f88d80-6a07-11eb-9134-f077059c83a6.png"  width="300" height="" /> |

</p>
</details>

**<details><summary>TEST CASE - AFTER FIX</summary>**
<p>

**WITH NOTCH**
- The black view on the bottom is visible
- The keyboard height is 282

| **Full Screen** | **Keyboard Did Show** |
|:-------------------------:|:-------------------------:|
| <img src="https://user-images.githubusercontent.com/24992535/107212619-81cdde00-6a07-11eb-9630-7e7c8c34d798.png" width="300" height="" /> | <img src="https://user-images.githubusercontent.com/24992535/107349053-0d0ea880-6ac8-11eb-9695-33128080b6b8.png"  width="300" height="" /> |

</p>
</details>

Reviewed By: ShikaSD

Differential Revision: D31207989

Pulled By: cortinico

fbshipit-source-id: 0955a3884201122166c5c0ae2aca988a0ed4af53

ReactAndroid/src/main/java/com/facebook/react/ReactRootView.java

@@ -16,8 +16,10 @@ import android.content.Context;
 import android.graphics.Canvas;
 import android.graphics.Point;
 import android.graphics.Rect;
+import android.os.Build;
 import android.os.Bundle;
 import android.util.AttributeSet;
+import android.view.DisplayCutout;
 import android.view.KeyEvent;
 import android.view.MotionEvent;
 import android.view.Surface;
@@ -647,6 +649,11 @@ public class ReactRootView extends FrameLayout implements RootView, ReactRoot {
     mJSTouchDispatcher = new JSTouchDispatcher(this);
   }
 
+  @VisibleForTesting
+  /* package */ void simulateCheckForKeyboardForTesting() {
+    getCustomGlobalLayoutListener().checkForKeyboardEvents();
+  }
+
   private CustomGlobalLayoutListener getCustomGlobalLayoutListener() {
     if (mCustomGlobalLayoutListener == null) {
       mCustomGlobalLayoutListener = new CustomGlobalLayoutListener();
@@ -766,8 +773,17 @@ public class ReactRootView extends FrameLayout implements RootView, ReactRoot {
 
     private void checkForKeyboardEvents() {
       getRootView().getWindowVisibleDisplayFrame(mVisibleViewArea);
+      int notchHeight = 0;
+      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
+        DisplayCutout displayCutout = getRootView().getRootWindowInsets().getDisplayCutout();
+        if (displayCutout != null) {
+          notchHeight = displayCutout.getSafeInsetTop();
+        }
+      }
       final int heightDiff =
-          DisplayMetricsHolder.getWindowDisplayMetrics().heightPixels - mVisibleViewArea.bottom;
+          DisplayMetricsHolder.getWindowDisplayMetrics().heightPixels
+              - mVisibleViewArea.bottom
+              + notchHeight;
 
       boolean isKeyboardShowingOrKeyboardHeightChanged =
           mKeyboardHeight != heightDiff && heightDiff > mMinKeyboardHeightDetected;