[Webkit-unassigned] [Bug 219369] REGRESSION (r268604): [ Mac ] fast/layoutformattingcontext/table-basic-row-vertical-align-baseline.html is a flaky crash

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=219369

Simon Fraser (smfr) <simon.fraser at apple.com> changed:

           What    |Removed                     |Added
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                 CC|                            |koivisto at iki.fi,
                   |                            |sam at webkit.org,
                   |                            |simon.fraser at apple.com

--- Comment #5 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
What's happening is that during TestController::resetStateToConsistentValues() there are lots of calls to WebPage::preferencesDidChange() via the async IPC, and for some of those calls both layoutFormattingContextIntegrationEnabled and layoutFormattingContextEnabled are true. If Display::view() does a paint at that time, then we hit assertions.

So the underlying causes are:
1. These two settings are incompatible with each other.
2. TestController::resetStateToConsistentValues() triggers lots of calls to WebPage::preferencesDidChange().

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