[Webkit-unassigned] [Bug 197731] Sometimes we hit ASSERT(!parentClipRect.isInfinite()) in RenderLayerBacking::computeParentGraphicsLayerRect

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=197731

--- Comment #1 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
This code runs when we have a m_ancestorClippingLayer, and we make one based on the result of RenderLayerCompositor::clippedByAncestor(), which uses:

layer.backgroundClipRect(RenderLayer::ClipRectsContext(computeClipRoot, TemporaryClipRects)).isInfinite()

However, RenderLayerBacking::computeParentGraphicsLayerRect() is doing:

        ShouldRespectOverflowClip shouldRespectOverflowClip = compositedAncestor->isolatesCompositedBlending() ? RespectOverflowClip : IgnoreOverflowClip;
        RenderLayer::ClipRectsContext clipRectsContext(compositedAncestor, TemporaryClipRects, IgnoreOverlayScrollbarSize, shouldRespectOverflowClip);
        LayoutRect parentClipRect = m_owningLayer.backgroundClipRect(clipRectsContext).rect(); // FIXME: Incorrect for CSS regions.

so 'shouldRespectOverflowClip' differs.

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