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LibWeb: Don't throw away UA shadow trees willy-nilly

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We were unnecessarily discarding the shadow trees of various elements
when they were removed or detached from the DOM.

This especially caused a *lot* of churn when creating input elements via
setting .innerHTML on something. We ended up building each input
element's shadow tree 3 times instead of 1.

The original issue that we were trying to solve by discarding shadow
trees appears to have been solved elsewhere, and nothing else seems to
break by just allowing them to remain in place.

1.05x speedup on Speedometer's TodoMVC-jQuery.
This commit is contained in:
Andreas Kling
2025-05-09 15:35:59 +02:00
committed by Tim Flynn
parent 123abe0e79
commit f61df9d34c
Notes: github-actions[bot] 2025-05-09 16:50:05 +00:00 
Author: https://github.com/awesomekling
Commit: https://github.com/LadybirdBrowser/ladybird/commit/f61df9d34cb
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/4673
Reviewed-by: https://github.com/trflynn89 ✅
12 changed files with 0 additions and 39 deletions
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Libraries/LibWeb/HTML/HTMLTextAreaElement.h
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@@ -70,7 +70,6 @@ public:
virtual WebIDL::ExceptionOr<void> cloned(Node&, bool) const override;
virtual void form_associated_element_was_inserted() override;
virtual void form_associated_element_was_removed(DOM::Node*) override;
virtual void form_associated_element_attribute_changed(FlyString const&, Optional<String> const&, Optional<FlyString> const&) override;
virtual void children_changed(ChildrenChangedMetadata const*) override;