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LibWeb: Speed up computed style calculation

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Rather than destroying and rebuilding the entire document layout tree in
every call to `ComputedCSSStyleDeclaration::property()`, we now just
make sure that the layout tree exists.

This speeds up the DOM Inspector significantly, from taking several
seconds to select an element, to almost instant. :^)
This commit is contained in:
Sam Atkins 2021-09-15 10:12:08 +01:00 • committed by Andreas Kling
parent 344397557c
commit 3f31f109b5
3 changed files with 8 additions and 1 deletions
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2
Userland/Libraries/LibWeb/CSS/ComputedCSSStyleDeclaration.cpp
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@ -381,7 +381,7 @@ static NonnullRefPtr<StyleValue> value_or_default(Optional<StyleProperty> proper
Optional<StyleProperty> ComputedCSSStyleDeclaration::property(PropertyID property_id) const
{
const_cast<DOM::Document&>(m_element->document()).force_layout();
const_cast<DOM::Document&>(m_element->document()).ensure_layout();
if (!m_element->layout_node()) {
auto style = m_element->document().style_resolver().resolve_style(const_cast<DOM::Element&>(*m_element));