Aliaksandr Kalenik 36ca93908a LibWeb: Unify abspos containing block resolution across FCs ...

Introduce AbsposContainingBlockInfo and a virtual
resolve_abspos_containing_block_info() method on FormattingContext that
computes the containing block rect, per-axis positioning mode (static
position vs inset-from-rect), and optional grid alignment — all in one
place.

The base implementation handles the common case: padding-box rect of
the containing block, with inline containing block support. GFC
overrides it to return the grid area rect with alignment info.

This replaces the per-context abspos loops that BFC, FFC, TFC, and GFC
each had, with a shared layout_absolutely_positioned_children() +
layout_absolutely_positioned_element() pair. The offset computation is
simplified from ~40 lines of branching to a data-driven dispatch on the
axis mode, and GFC's ~130-line custom layout method is replaced by a
~30-line resolve override.

2026-02-14 22:50:24 +01:00

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