[Webkit-unassigned] [Bug 222720] REGRESSION(r272900): Nullptr crash in ComposedTreeIterator::traverseNextInShadowTree() via ShadowRoot::hostChildElementDidChange

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=222720

--- Comment #49 from Ryosuke Niwa <rniwa at webkit.org> ---
Created attachment 425361

  --> https://bugs.webkit.org/attachment.cgi?id=425361&action=review

Another test case

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