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LibWeb/HTML: Add fastpath to skip selectedness update on option insert

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This extends the optimization introduced in the previous commit to
also apply to the inserted steps for an option element. This makes
the test:

https://wpt.live/html/select/options-length-too-large.html

Go from not ever completing due to how slow it was to running, to
finishing in 800ms on my PC :^)
This commit is contained in:
Shannon Booth 2025-01-27 13:35:18 +13:00 • committed by Andrew Kaster
parent 075c7ea63e
commit ebd6d49415
Notes: github-actions[bot] 2025-01-30 20:56:39 +00:00
3 changed files with 22 additions and 14 deletions
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6
Libraries/LibWeb/HTML/HTMLOptionElement.cpp
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@ -234,8 +234,10 @@ void HTMLOptionElement::inserted()
// If insertedNode's parent is a select element,
// or insertedNode's parent is an optgroup element whose parent is a select element,
// then run that select element's selectedness setting algorithm.
if (auto select_element = owner_select_element())
select_element->update_selectedness();
if (auto select_element = owner_select_element()) {
if (!select_element->can_skip_selectedness_update_for_inserted_option(*this))
select_element->update_selectedness();
}
}
void HTMLOptionElement::removed_from(Node* old_parent, Node& old_root)