Andreas Kling e5d521bef8 LibWeb: Enable partial layout tree update in a bunch of cases ...

These common cases now cause us to invalidate the layout tree starting
at the relevant parent node instead of invalidating the entire tree.

- DOM node insertion
- DOM node removal
- innerHTML setter
- textContent setter

This makes a lot of dynamic content much faster. For example, demos
on shadertoy.com go from ~18 fps to ~28 fps on my machine.

2025-01-18 21:01:01 +01:00

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