Aliaksandr Kalenik edf1ca8f19 LibWeb: Restrict throwaway layout states to their subtree ...

Throwaway LayoutState instances used for intrinsic sizing should not
access nodes outside the laid-out subtree. Make this explicit by setting
a subtree root on each throwaway state, pre-populating only the
immediate containing block, and using try_get() for any ancestor
lookups — treating unavailable ancestors as indefinite rather than
silently populating them with incorrectly-resolved values.

2026-02-27 19:11:41 +01:00

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