Treat GONE windows as READY for sync

Otherwise we will wait on them until the sync timeout.

Bug: 183993924
Test: atest AppConfigurationTests#testAppOrientationRequestConfigChange
Change-Id: I5e4050cc36997d87dcc3192d53959f7b56d516b0

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

@@ -5974,7 +5974,7 @@ class WindowState extends WindowContainer<WindowState> implements WindowManagerP
         // since a generic WindowContainer only needs to wait for its
         // children to finish and is immediately ready from its own
         // perspective but at the WindowState level we need to wait for ourselves
-        // to draw even if the children draw first our don't need to sync, so we start
+        // to draw even if the children draw first or don't need to sync, so we start
         // in WAITING state rather than READY.
         mSyncState = SYNC_STATE_WAITING_FOR_DRAW;
         requestRedrawForSync();
@@ -5985,6 +5985,16 @@ class WindowState extends WindowContainer<WindowState> implements WindowManagerP
         return true;
     }
 
+    @Override
+    boolean isSyncFinished() {
+        if (mSyncState == SYNC_STATE_WAITING_FOR_DRAW && mViewVisibility == View.GONE) {
+            // Don't wait for GONE windows. However, we don't alter the state in case the window
+            // becomes un-gone while the syncset is still active.
+            return true;
+        }
+        return super.isSyncFinished();
+    }
+
     boolean finishDrawing(SurfaceControl.Transaction postDrawTransaction) {
         if (mOrientationChangeRedrawRequestTime > 0) {
             final long duration =