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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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6
Userland/Libraries/LibWeb/DOM/Document.cpp
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@ -400,6 +400,12 @@ void Document::force_layout()
update_layout();
}
void Document::ensure_layout()
{
if (!m_layout_root)
update_layout();
}
void Document::update_layout()
{
if (!browsing_context())