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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
3 changed files with 22 additions and 14 deletions
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28
Libraries/LibWeb/HTML/HTMLSelectElement.cpp
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@@ -293,6 +293,20 @@ i32 HTMLSelectElement::default_tab_index_value() const
return 0;
}
bool HTMLSelectElement::can_skip_selectedness_update_for_inserted_option(HTMLOptionElement const& option) const
{
if (option.selected())
return false;
if (m_cached_number_of_selected_options >= 2)
return false;
if (display_size() == 1 && m_cached_number_of_selected_options == 0)
return false;
return true;
}
bool HTMLSelectElement::can_skip_children_changed_selectedness_update(ChildrenChangedMetadata const& metadata) const
{
// If the following criteria are met, there is no need to re-run the selectedness algorithm.
@@ -300,18 +314,8 @@ bool HTMLSelectElement::can_skip_children_changed_selectedness_update(ChildrenCh
if (metadata.type != ChildrenChangedMetadata::Type::Inserted)
return false;
if (auto* option = as_if<HTMLOptionElement>(*metadata.node)) {
if (option->selected())
return false;
if (m_cached_number_of_selected_options >= 2)
return false;
if (display_size() == 1 && m_cached_number_of_selected_options == 0)
return false;
return true;
}
if (auto* option = as_if<HTMLOptionElement>(*metadata.node))
return can_skip_selectedness_update_for_inserted_option(*option);
return false;
}