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LibWeb: Coalesce layouts that happen in response to style changes

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Instead of doing a forced layout synchronously whenever an element's
style is changed, use a zero-timer to do the forced relayout on next
event loop iteration.

This effectively coalesces a lot of layouts and makes many pages such
as GitHub spend way less time doing redundant layout work.
This commit is contained in:
Andreas Kling
2021-01-09 15:07:37 +01:00
parent d56f4f635a
commit 1d75e82101
3 changed files with 14 additions and 1 deletions
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2
Libraries/LibWeb/DOM/Document.h
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@@ -132,6 +132,7 @@ public:
Layout::InitialContainingBlockBox* layout_node();
void schedule_style_update();
void schedule_forced_layout();
NonnullRefPtrVector<Element> get_elements_by_name(const String&) const;
NonnullRefPtrVector<Element> get_elements_by_tag_name(const FlyString&) const;
@@ -262,6 +263,7 @@ private:
Optional<Color> m_visited_link_color;
RefPtr<Core::Timer> m_style_update_timer;
RefPtr<Core::Timer> m_forced_layout_timer;
String m_source;