Merge "Forward back key events when no top onBackInvokedCallback registered." into main

                    }

                }

            }

            if (keyEvent.getAction() == KeyEvent.ACTION_UP) {

            // Do not cancel the keyEvent if no callback can handle the back event.

            if (topCallback != null && keyEvent.getAction() == KeyEvent.ACTION_UP) {

                // forward a cancelled event so that following stages cancel their back logic

                keyEvent.cancel();

            }