Sam Atkins 3f31f109b5 LibWeb: Speed up computed style calculation ...

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. :^)

2021-09-15 11:24:11 +02:00

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