Aliaksandr Kalenik 24f6e697d9 LibWeb: Optimize stacking context tree rebuilds ...

Previously, any change to a property that affects stacking context would
trigger a full stacking context tree rebuild. However, an element only
creates or destroys a stacking context when a property crosses from its
"neutral" value to a "creating" value (or vice versa).

For example, animating `transform: translateX(10px)` to
`transform: translateX(20px)` previously triggered stacking context
rebuilds on every frame, but this is unnecessary because the stacking
context already exists.

2026-01-28 18:05:41 +01:00

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