зеркало из https://github.com/mozilla/gecko-dev.git
be6329111c
What goes on here is that there's a couple of unfortunate style change sequences which end up making us not do the EffectsInfo dance correctly. Twitter uses (maybe didn't use to, which would explain the regression) a visibility: hidden, out-of-flow iframe for a bit (which we correctly throttle). But then they switch to an in-flow, visible, zero-height iframe. That we should _not_ throttle. However, we end up not getting to the display list code at all, because nsBlockFrame decides that we don't need to descend into an empty line[1]. It seems less error prone to re-use the IntersectionObserver timing and computation to determine whether the iframe is visible. That completely matches in-process iframes, too. Removing the empty frame border and putting them on an empty line in dom/base/test/test_bug1639328.html is enough to reproduce the issue without this patch. [1]: https://searchfox.org/mozilla-central/rev/fe2743c6c5c708061c7f6504b26958fcc815bb4a/layout/generic/nsBlockFrame.cpp#7569-7579 Differential Revision: https://phabricator.services.mozilla.com/D207479 |
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| inspector | ||
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| mathml | ||
| painting | ||
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| style | ||
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