Exclude views that aren't on screen from Activity Transitions.

        if (getViewsTransition() != null) {

            getDecor().captureTransitioningViews(mTransitioningViews);

            mTransitioningViews.removeAll(mSharedElements);

            Rect r = new Rect();

            for (int i = mTransitioningViews.size() - 1; i >= 0; i--) {

                View view = mTransitioningViews.get(i);

                if (!view.getGlobalVisibleRect(r)) {

                    mTransitioningViews.remove(i);

                }

            }

        }

        setEpicenter();

    }