Andreas Kling 49a7a0f378 LibWeb: Avoid invalidation on .textContent setter no-op ...

When setting the textContent of an element with no children to null or
the empty string, nothing happens. Even so, we were still invalidating
style, layout and collections, causing pointless churn.

Skipping invalidation in this case also revealed that we were missing
invalidation when changing the selected state of HTMLOptionElement.
This was all caught by existing tests already in-tree. :^)

2025-01-05 13:36:17 +01:00

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