Aliaksandr Kalenik c9108a2ad5 LibWeb: Only set has_scrollable_overflow for scroll containers ...

Previously, has_scrollable_overflow was a purely geometric check, true
whenever content extended beyond the padding box regardless of the
overflow property. This caused unnecessary scroll frame allocation for
boxes with `overflow:visible`.

Per CSS Overflow 3, scrollable overflow is only defined for scroll
containers (overflow: auto/hidden/scroll). Gate the flag on
`is_scroll_container()` so that only actual scroll containers get scroll
frames assigned.

2026-01-29 14:59:32 +01:00

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