[Webkit-unassigned] [Bug 222202] REGRESSION (r266695): twitch.tv: when in fullscreen, WebKit continually does 350ms layouts. Firefox and Chrome do not

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=222202

--- Comment #7 from Sergio Villar Senin <svillar at igalia.com> ---
I haven't inspected the page in detail but if it's using nested column flexboxes with percentages then it could indeed hit hard because in the calls to updateBlockChildDirtyBitsBeforeLayout() we have:

    if (relayoutChildren || (child.hasRelativeLogicalHeight() && !isRenderView()))

That very same method has the following comment:
    // FIXME: Technically percentage height objects only need a relayout if their percentage isn't going to be turned into
    // an auto value. Add a method to determine this, so that we can avoid the relayout.

However changing it seems risky as it might potentially affect everything not only flexbox.

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