Merge "Fix light bar flickers" into oc-dr1-dev

services/core/java/com/android/server/wm/AppWindowAnimator.java

@@ -198,6 +198,14 @@ public class AppWindowAnimator {
         return animation != null || mAppToken.inPendingTransaction;
     }
 
+    /**
+     * @return whether an animation is about to start, i.e. the animation is set already but we
+     *         haven't processed the first frame yet.
+     */
+    boolean isAnimationStarting() {
+        return animation != null && !animating;
+    }
+
     public int getTransit() {
         return mTransit;
     }

services/core/java/com/android/server/wm/WindowState.java

@@ -1458,8 +1458,18 @@ class WindowState extends WindowContainer<WindowState> implements WindowManagerP
     @Override
     public boolean canAffectSystemUiFlags() {
         final boolean shown = mWinAnimator.getShown();
-        final boolean exiting = mAnimatingExit || mDestroying
-                || mAppToken != null && mAppToken.hidden;
+
+        // We only consider the app to be exiting when the animation has started. After the app
+        // transition is executed the windows are marked exiting before the new windows have been
+        // shown. Thus, wait considering a window to be exiting after the animation has actually
+        // started.
+        final boolean appAnimationStarting = mAppToken != null
+                && mAppToken.mAppAnimator.isAnimationStarting();
+        final boolean exitingSelf = mAnimatingExit && (!mWinAnimator.isAnimationStarting()
+                && !appAnimationStarting);
+        final boolean appExiting = mAppToken != null && mAppToken.hidden && !appAnimationStarting;
+
+        final boolean exiting = exitingSelf || mDestroying || appExiting;
         final boolean translucent = mAttrs.alpha == 0.0f;
         return shown && !exiting && !translucent;
     }