Andreas Kling f5c2e87965 LibWeb: Sort stacking context tree once, after fully building it ...

Instead of calling quick_sort() every time a StackingContext child
is added to a parent, we now do a single pass of sorting work after the
full StackingContext tree has been built.

Before this change, the quick_sort() was ~13.5% of the profile while
hovering links on GitHub in the Browser. After the change, it's down to
~0.6%. Pretty good! :^)

2022-03-13 18:09:43 +01:00

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