NEW182495
Should be able to moveAllChildrenTo() without broadcasting the removes/inserts. 
https://bugs.webkit.org/show_bug.cgi?id=182495
Summary Should be able to moveAllChildrenTo() without broadcasting the removes/inserts.
alan
Reported 2018-02-05 10:46:32 PST
RenderElement::insertChildInternal calls newChild->insertedIntoTree() which has some side effects (e.g. multicol) since it's not a real insert, it's just reparenting.
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Radar WebKit Bug Importer
Comment 1 2018-02-05 10:47:11 PST
<rdar://problem/37242698>
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