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Mechanism for restricting pinch zooming when gesture is a two finger pan. If the pinch span is below a given threshold and the scroll distance above a given threshold then the zoom level is maintained to allow for smooth panning with two fingers. MozReview-Commit-ID: 62Fv0WeplOo --HG-- extra : rebase_source : 71d7da4c4b4cc3a5adde13ad1a7c1fbf49856c35