Aliaksandr Kalenik a3a6d73145 LibWeb: Replace static position ancestor walk with cumulative offset ...

Replace content_box_rect_in_static_position_ancestor_coordinate_space()
which walked the ancestor chain to compute the offset between an abspos
element's static position containing block and its actual containing
block.

Instead, add a cumulative_offset() method to UsedValues that computes
the absolute offset from the ICB to a box's content edge by walking the
containing block chain. For pre-populated nodes during partial relayout,
it returns a cached value from the paintable's absolute position.

The static-CB-to-actual-CB offset is now a simple subtraction of two
cumulative offsets, which also fixes a bug where table cells with
position:relative ancestors got incorrect static positions due to the
old function accumulating offsets in the wrong coordinate space.

Also route direct UsedValues::offset assignments in Flex, Grid, and
Table formatting contexts through set_content_offset().

2026-02-14 18:44:50 +01:00

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