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When continuing a gesture during quick switch, we cancel the previous animation but don't invalidate it (since the gesture isn't fully finished), and the new gesture handler calls mRecentsView.setOnPageTransitionEndCallback(), so the previous handler will never get STATE_RECENTS_SCROLLING_FINISHED. Thus, continueComputingRecentsScrollIfNecessary() will never end. To fix this, also check !mCanceled, since that is set when continuing the gesture. Also use postOnAnimation() instead of post() since that has better guarantees that the next computation will wait for the next animation frame, rather than whenever the message queue is available, which might happen too frequently. Test: quick switch from A to B and back to A before settling on B, ensure we stop calling computeScroll(). Bug: 153589287 Change-Id: I6b4389ef2cf5a818438c7ae36d8807b3e41c8501