Aliaksandr Kalenik 10b2ce49dc LibWeb: Invalidate style before running insertion steps ...

This fixes issue reproducing with following steps:
1. Node::insert_before() adopts a node into another document.
2. Node::insert_before() runs insertion steps for adopted node (adopted
   node style is not invalidated yet).
3. Insertion steps execute spin_until() on event loop.
4. The next task on event loop does Document::update_style() which
   requires layout tree rebuild.
5. Layout tree rebuild fails because there is a node with invalidated
   style.

2023-09-16 16:53:32 +02:00

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