[Webkit-unassigned] [Bug 219905] ASSERTION FAILED: &layoutState().establishedFormattingState(layoutBox.formattingContextRoot()) == this in WebCore::Layout::FormattingState::boxGeometry

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=219905

--- Comment #1 from Ryan Haddad <ryanhaddad at apple.com> ---
This is the assert from FormattingState.cpp:54
>    // Should never need to mutate a display box outside of the formatting context.
>    > ASSERT(&layoutState().establishedFormattingState(layoutBox.formattingContextRoot()) == this);

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