[Webkit-unassigned] [Bug 222124] New: RenderLayer::calculateLayerBounds() is wrong with clipping

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=222124

            Bug ID: 222124
           Summary: RenderLayer::calculateLayerBounds() is wrong with
                    clipping
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Compositing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com
                CC: simon.fraser at apple.com

Created attachment 420859

  --> https://bugs.webkit.org/attachment.cgi?id=420859&action=review

Test case

The UseLocalClipRectIfPossible code path in RenderLayer::calculateLayerBounds() assumes that all descendants are affected by the clip, but that'd wrong; this layer might not be in the containing block ancestry of descendant layers.

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