Merge "Ensure arraylist index is montonically decreasing" into lmp-mr1-dev

    @Override

    void removeAllWindows() {

        int winNdx;

        while ((winNdx = allAppWindows.size()) > 0) {

            WindowState win = allAppWindows.get(winNdx - 1);

        for (int winNdx = allAppWindows.size() - 1; winNdx >= 0;

                // removeWindowLocked at bottom of loop may remove multiple entries from

                // allAppWindows if the window to be removed has child windows. It also may

                // not remove any windows from allAppWindows at all if win is exiting and

                // currently animating away. This ensures that winNdx is monotonically decreasing

                // and never beyond allAppWindows bounds.

                winNdx = Math.min(winNdx - 1, allAppWindows.size() - 1)) {

            WindowState win = allAppWindows.get(winNdx);

            if (WindowManagerService.DEBUG_WINDOW_MOVEMENT) {

                Slog.w(WindowManagerService.TAG, "removeAllWindows: removing win=" + win);

            }

            // {@link WindowManagerService.removeWindowLocked} may remove multiple entries from

            // {@link #allAppWindows} if the window to be removed has child windows.

            win.mService.removeWindowLocked(win.mSession, win);

        }

    }