Remove useEditTextStockAndroidBehavior and resolve old android blur issue (#51338) (#51462)

Summary:
Pull Request resolved: #51338

There was some problems removing this feature flag earlier in that, on older android versions, we would try to focus the top most text input whenever any other text input would try to blur. This was ultimately and issue with how Android implements `clearFocus`. To fix this, lets block the focusability of all views while we clear the focus, then re-enable.

Changelog: [Internal]

Reviewed By: NickGerleman

Differential Revision: D74760594

fbshipit-source-id: 2811c08ad6ed0855da0a4d7fca89fb08f84905c2

Author: joevilches

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

@@ -6565,7 +6565,6 @@ public class com/facebook/react/views/textinput/ReactEditText : androidx/appcomp
 	public fun addTextChangedListener (Landroid/text/TextWatcher;)V
 	protected final fun applyTextAttributes ()V
 	public final fun canUpdateWithEventCount (I)Z
-	public fun clearFocus ()V
 	protected final fun finalize ()V
 	public final fun getBorderColor (I)I
 	protected final fun getContainsImages ()Z

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/views/textinput/ReactEditText.kt

@@ -35,6 +35,7 @@ import android.view.Menu
 import android.view.MenuItem
 import android.view.MotionEvent
 import android.view.View
+import android.view.ViewGroup
 import android.view.accessibility.AccessibilityNodeInfo
 import android.view.inputmethod.EditorInfo
 import android.view.inputmethod.InputConnection
@@ -359,11 +360,26 @@ public open class ReactEditText public constructor(context: Context) : AppCompat
       super.onTextContextMenuItem(
           if (id == android.R.id.paste) android.R.id.pasteAsPlainText else id)
 
-  override fun clearFocus() {
-    super.clearFocus()
+  internal fun clearFocusAndMaybeRefocus() {
+    if (Build.VERSION.SDK_INT > Build.VERSION_CODES.P || !isInTouchMode) {
+      super.clearFocus()
+    } else {
+      // Avoid refocusing to a new view on old versions of Android by default
+      // by preventing `requestFocus()` on the rootView from moving focus to any child.
+      // https://cs.android.com/android/_/android/platform/frameworks/base/+/bdc66cb5a0ef513f4306edf9156cc978b08e06e4
+      val rootViewGroup = rootView as ViewGroup
+      val oldDescendantFocusability = rootViewGroup.descendantFocusability
+      rootViewGroup.descendantFocusability = ViewGroup.FOCUS_BLOCK_DESCENDANTS
+      super.clearFocus()
+      rootViewGroup.descendantFocusability = oldDescendantFocusability
+    }
     hideSoftKeyboard()
   }
 
+  internal fun clearFocusFromJS() {
+    clearFocusAndMaybeRefocus()
+  }
+
   // For cases like autoFocus, or ref.focus() where we request focus programmatically and not
   // through
   // interacting with the EditText directly (like clicking on it). We cannot use stock
@@ -598,10 +614,6 @@ public open class ReactEditText public constructor(context: Context) : AppCompat
     requestFocusProgrammatically()
   }
 
-  internal fun clearFocusFromJS() {
-    clearFocus()
-  }
-
   public fun incrementAndGetEventCounter(): Int = ++nativeEventCount
 
   public fun maybeSetTextFromJS(reactTextUpdate: ReactTextUpdate) {

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/views/textinput/ReactTextInputManager.kt

@@ -926,7 +926,7 @@ public open class ReactTextInputManager public constructor() :
         }
 
         if (shouldBlur) {
-          editText.clearFocus()
+          editText.clearFocusAndMaybeRefocus()
         }
 
         // Prevent default behavior except when we want it to insert a newline.