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Conceptually, a repaint request that arrives in APZCCallbackHelper with !GetScrollOffsetUpdated() is a repaint request that the APZ is sending in response to a main-thread update it received. The purpose of the repaint request is mainly to update the displayport margins; the scroll position and resolution should not have changed. Therefore actively trying to set the scroll position or resolution as a result of these repaint requests should at best be a no-op but often triggers unnecessary clobbering of things that are in-flight, or extra reflows. This can result in buggy behaviour. Bug 1286179 avoided doing this for the scroll position, and this patch does the equivalent thing for zooming. MozReview-Commit-ID: 91RbRP0ZHBe --HG-- extra : rebase_source : 7bb97075619f5435705d369a695d37aa1c972278 |
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