Merge "Do not forward & register IME compat back callback in the app process." into udc-dev

core/java/android/view/ViewRootImpl.java

@@ -11382,6 +11382,10 @@ public final class ViewRootImpl implements ViewParent,
             sendBackKeyEvent(KeyEvent.ACTION_DOWN);
             sendBackKeyEvent(KeyEvent.ACTION_UP);
         };
+        if (mOnBackInvokedDispatcher.hasImeOnBackInvokedDispatcher()) {
+            Log.d(TAG, "Skip registering CompatOnBackInvokedCallback on IME dispatcher");
+            return;
+        }
         mOnBackInvokedDispatcher.registerOnBackInvokedCallback(
                 OnBackInvokedDispatcher.PRIORITY_DEFAULT, mCompatOnBackInvokedCallback);
     }

core/java/android/window/WindowOnBackInvokedDispatcher.java

@@ -357,6 +357,11 @@ public class WindowOnBackInvokedDispatcher implements OnBackInvokedDispatcher {
         mImeDispatcher = imeDispatcher;
     }
 
+    /** Returns true if a non-null {@link ImeOnBackInvokedDispatcher} has been set. **/
+    public boolean hasImeOnBackInvokedDispatcher() {
+        return mImeDispatcher != null;
+    }
+
     /**
      * Class used to check whether a callback can be registered or not. This is meant to be
      * shared with {@link ProxyOnBackInvokedDispatcher} which needs to do the same checks.