Merge "Fix race condition causing screenshot view to be added to window twice" into sc-qpr1-dev

packages/SystemUI/src/com/android/systemui/screenshot/ScreenshotController.java

@@ -33,6 +33,7 @@ import static java.util.Objects.requireNonNull;
 
 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
+import android.annotation.MainThread;
 import android.annotation.Nullable;
 import android.app.ActivityManager;
 import android.app.ActivityOptions;
@@ -261,6 +262,7 @@ public class ScreenshotController {
     private Bitmap mScreenBitmap;
     private SaveImageInBackgroundTask mSaveInBgTask;
     private boolean mScreenshotTakenInPortrait;
+    private boolean mBlockAttach;
 
     private Animator mScreenshotAnimation;
     private RequestCallback mCurrentRequestCallback;
@@ -731,6 +733,7 @@ public class ScreenshotController {
                     new ViewTreeObserver.OnWindowAttachListener() {
                         @Override
                         public void onWindowAttached() {
+                            mBlockAttach = false;
                             decorView.getViewTreeObserver().removeOnWindowAttachListener(this);
                             action.run();
                         }
@@ -747,14 +750,16 @@ public class ScreenshotController {
         mWindow.setContentView(contentView);
     }
 
+    @MainThread
     private void attachWindow() {
         View decorView = mWindow.getDecorView();
-        if (decorView.isAttachedToWindow()) {
+        if (decorView.isAttachedToWindow() || mBlockAttach) {
             return;
         }
         if (DEBUG_WINDOW) {
             Log.d(TAG, "attachWindow");
         }
+        mBlockAttach = true;
         mWindowManager.addView(decorView, mWindowLayoutParams);
         decorView.requestApplyInsets();
     }