[Webkit-unassigned] [Bug 256193] New: Assert that the scrolling tree is valid, and fix issues with negative z-index layers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=256193

            Bug ID: 256193
           Summary: Assert that the scrolling tree is valid, and fix
                    issues with negative z-index layers
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com
                CC: simon.fraser at apple.com

We need to assert in the web process that a committed scrolling tree is valid, which will make it easier to track down causes of MESSAGE_CHECKs related to invalid scrolling trees.

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