[Webkit-unassigned] [Bug 247051] New: Null check containingShadowRoot in more places

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=247051

            Bug ID: 247051
           Summary: Null check containingShadowRoot in more places
           Product: WebKit
           Version: Safari 15
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rbuis at igalia.com

Elements can be marked as being in a shadow tree and at the same time
containingShadowRoot can be null (for example when removing/disconnecting
elements), so null check containingShadowRoot in more places.

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