[Webkit-unassigned] [Bug 225141] New: don't try to create custom scrollbars for fullscreen placeholders

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=225141

            Bug ID: 225141
           Summary: don't try to create custom scrollbars for fullscreen
                    placeholders
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: heycam at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

We can end up calling RenderScrollbar::createCustomScrollbar with `element = nullptr` from RenderLayerScrollableArea::createScrollbar, when the renderer is a RenderFullscreenPlaceholder.

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