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10b2ce49dc
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.