Merge "Fix "appearance glitch" in Back Arrow" into tm-qpr-dev

                velocityTracker = null

            }

            MotionEvent.ACTION_CANCEL -> {

                updateArrowState(GestureState.CANCELLED)

                // Receiving a CANCEL implies that something else intercepted

                // the gesture, i.e., the user did not cancel their gesture.

                // Therefore, disappear immediately, with minimum fanfare.

                updateArrowState(GestureState.GONE)

                velocityTracker = null

            }

        }