Merge "Do not create window decorations for split roots" into udc-dev

libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/SplitScreenController.java

@@ -337,6 +337,11 @@ public class SplitScreenController implements DragAndDropPolicy.Starter,
         return isTaskInSplitScreen(taskId) && isSplitScreenVisible();
     }
 
+    /** Check whether the task is the single-top root or the root of one of the stages. */
+    public boolean isTaskRootOrStageRoot(int taskId) {
+        return mStageCoordinator.isRootOrStageRoot(taskId);
+    }
+
     public @SplitPosition int getSplitPosition(int taskId) {
         return mStageCoordinator.getSplitPosition(taskId);
     }

libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/StageCoordinator.java

@@ -377,6 +377,13 @@ public class StageCoordinator implements SplitLayout.SplitLayoutHandler,
         return STAGE_TYPE_UNDEFINED;
     }
 
+    boolean isRootOrStageRoot(int taskId) {
+        if (mRootTaskInfo != null && mRootTaskInfo.taskId == taskId) {
+            return true;
+        }
+        return mMainStage.isRootTaskId(taskId) || mSideStage.isRootTaskId(taskId);
+    }
+
     boolean moveToStage(ActivityManager.RunningTaskInfo task, @SplitPosition int stagePosition,
             WindowContainerTransaction wct) {
         prepareEnterSplitScreen(wct, task, stagePosition);

libs/WindowManager/Shell/src/com/android/wm/shell/splitscreen/StageTaskListener.java

@@ -286,6 +286,10 @@ class StageTaskListener implements ShellTaskOrganizer.TaskListener {
         }
     }
 
+    boolean isRootTaskId(int taskId) {
+        return mRootTaskInfo != null && mRootTaskInfo.taskId == taskId;
+    }
+
     void onResizing(Rect newBounds, Rect sideBounds, SurfaceControl.Transaction t, int offsetX,
             int offsetY, boolean immediately) {
         if (mSplitDecorManager != null && mRootTaskInfo != null) {

libs/WindowManager/Shell/src/com/android/wm/shell/windowdecor/DesktopModeWindowDecorViewModel.java

@@ -760,6 +760,10 @@ public class DesktopModeWindowDecorViewModel implements WindowDecorViewModel {
 
     private boolean shouldShowWindowDecor(RunningTaskInfo taskInfo) {
         if (taskInfo.getWindowingMode() == WINDOWING_MODE_FREEFORM) return true;
+        if (mSplitScreenController.isPresent()
+                && mSplitScreenController.get().isTaskRootOrStageRoot(taskInfo.taskId)) {
+            return false;
+        }
         return DesktopModeStatus.isProto2Enabled()
                 && taskInfo.getActivityType() == ACTIVITY_TYPE_STANDARD
                 && mDisplayController.getDisplayContext(taskInfo.displayId)