Andreas Kling 2dd03a4200 LibWeb: Abort event handling if underlying layout tree disappears ...

We didn't notice that the layout tree had disappeared after dispatching
a mousedown event, because we only checked EventHandler::layout_root()
which happily returned the *new* layout tree after a window.reload().

This patch fixes that by verifying that the frame is still showing the
same DOM's layout tree after event dispatch.

Fixes #4224.

2020-11-29 16:43:12 +01:00

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