If an <input> element's UA shadow tree is pending, and the element moves document before we create the shadow tree under a style flush, we need to let the new document know to do it.
<rdar://90682918>
Created attachment 455877 [details] Patch
Committed r291961 (248926@main): <https://commits.webkit.org/248926@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 455877 [details].
*** Bug 241954 has been marked as a duplicate of this bug. ***