am a7a99981: Merge "Fix Presentation window is removed on stack change"

        if (NW > 0) {

            mWindowsChanged = true;

        }

        int targetDisplayId = -1;

        Task targetTask = mTaskIdToTask.get(token.appWindowToken.groupId);

        if (targetTask != null) {

            DisplayContent targetDisplayContent = targetTask.getDisplayContent();

            if (targetDisplayContent != null) {

                targetDisplayId = targetDisplayContent.getDisplayId();

            }

        }

        for (int i = 0; i < NW; i++) {

            WindowState win = windows.get(i);

            if (targetDisplayId != -1 && win.getDisplayId() != targetDisplayId) {

                continue;

            }

            if (DEBUG_WINDOW_MOVEMENT) Slog.v(TAG, "Tmp removing app window " + win);

            win.getWindowList().remove(win);

            int j = win.mChildWindows.size();