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We have an optimization to avoid an expensive reflow from SetFullZoom, see mSuppressResizeReflow[1]. That was done because we used to do a full synchronous reflow right after. We no longer do that, but due to that member we also don't invalidate! My second patch in this bug changes the behavior of that flag so that we don't synchronously reflow, but we do invalidate. So in turn this test before the change wasn't really testing the zoomed code-path since it was using the clean layout from before the zoom operation. a11y getBounds and co. don't flush layout (they probably should), but since with my patch we dirty the frame tree, and dirty frames return bogus offsets, the test starts failing. Flush layout explicitly to ensure we're testing the zoomed code path. [1]: https://searchfox.org/mozilla-central/rev/325c1a707819602feff736f129cb36055ba6d94f/layout/base/nsPresContext.cpp#952 Differential Revision: https://phabricator.services.mozilla.com/D43952 --HG-- extra : moz-landing-system : lando |
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