Andreas Kling 0af2795662 LibWeb: Tear down layout trees properly ...

Instead of just ripping out the root of the layout tree from its RefPtr
in Document, actually go through the DOM and gather up all the layout
nodes. Then destroy them all in one swoop.

Also, make sure to do this when detaching Document from Frame,
to enforce the invariant that layout only occurs in framed documents.

2020-10-20 18:08:37 +02:00

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