Andreas Kling 8c88ee1165 LibWeb: Only invalidate stacking context tree for opacity/z-index change ...

I came across some websites that change an elements CSS "opacity" in
their :hover selectors. That caused us to relayout on hover, which we'd
like to avoid.

With this patch, we now check if a property only affects the stacking
context tree, and if nothing layout-affecting has changed, we only
invalidate the stacking context tree, causing it to be rebuilt on next
paint or hit test.

This makes :hover { opacity: ... } rules much faster. :^)

2022-03-21 13:03:33 +01:00

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