Aliaksandr Kalenik d762d16938 LibWeb: Use invalidation sets for :has() invalidation ...

Prior to this change, we invalidated all elements in the document if it
used any selectors with :has(). This change aims to improve that by
applying a combination of techniques:
- Collect metadata for each element if it was matched against a selector
  with :has() in the subject position. This is needed to invalidate all
  elements that could be affected by selectors like `div:has(.a:empty)`
  because they are not covered by the invalidation sets.
- Use invalidation sets to invalidate elements that are affected by
  selectors with :has() in a non-subject position.

Selectors like `.a:has(.b) + .c` still cause whole-document invalidation
because invalidation sets cover only descendants, not siblings. As a
result, there is no performance improvement on github.com due to this
limitation. However, youtube.com and discord.com benefit from this
change.

2025-01-29 09:30:18 +01:00

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