Aliaksandr Kalenik 3c73457b26 LibWeb: Implement CSS Grid dense packing and fix span placement ...

Implement the `dense` keyword for `grid-auto-flow` so auto-placed items
backfill earlier gaps in the grid. The sparse/dense cursor logic is now
centralized in `place_grid_items()` step 4: dense resets the cursor to
the grid start before each search, while sparse keeps advancing forward.

Also fix a pre-existing bug where `find_unoccupied_place()` and several
placement helpers only checked if a single cell was unoccupied, ignoring
multi-cell spans. Add `OccupationGrid::is_area_occupied()` and use it
throughout to correctly verify the entire rectangular area is available.

2026-02-16 20:00:17 +01:00

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grid-container-change-named-grid-recompute-child-positions-001.txt

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