[Webkit-unassigned] [Bug 246735] New: Don't unnecessarily tear down top layer renderers in RenderTreeUpdater

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=246735

            Bug ID: 246735
           Summary: Don't unnecessarily tear down top layer renderers in
                    RenderTreeUpdater
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ntim at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

The only reason the element.isInTopLayer() check added by https://commits.webkit.org/246767@main is there is because entering top layer forces `display: contents` style to `display: block`. This  check is now redundant with https://commits.webkit.org/255527@main, since it is fixing the same issue more globally.

Test: fast/css/top-layer-display-contents-crash.html

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