Files
rust_browser/tests/goldens/expected/152-grid-negative-line-numbers.layout.txt
Zachary D. Rowitsch 137a89403b Fix grid auto-placement and negative line number resolution
Two grid placement bugs:

1. Items with explicit column but auto row (e.g. `grid-column: 2`)
   were hardcoded to row 0 by merge_placements, causing overlap with
   earlier rows. Now only fully-specified placements skip auto-placement,
   and Phase 2 respects explicit column/row constraints.

2. Negative grid line numbers were off-by-one. CSS Grid has N+1 lines
   for N tracks, so line -1 should resolve to index N (after the last
   track), not N-1. This caused `grid-column: 1 / -1` to span N-1
   columns instead of all N, producing asymmetric gutters.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-02-12 22:34:59 -05:00

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LayoutBox node=#2 tag=html box=block
content: (0, 0, 800, 55)
padding: 0 0 0 0
border: 0 0 0 0
margin: 0 0 0 0
LayoutBox node=#10 tag=body box=grid
content: (0, 0, 800, 55)
padding: 0 0 0 0
border: 0 0 0 0
margin: 0 0 0 0
LayoutBox node=#12 tag=div box=block
content: (0, 0, 300, 30)
padding: 0 0 0 0
border: 0 0 0 0
margin: 0 0 0 0
inline_context: 1 lines, height=19.2, max_width=19.418503
line[0]: rect=(0, 0, 19.418503, 19.2) fragments=1
frag[0]: rect=(0, 0, 19.418503, 16) text="Full" start=false end=false
LayoutBox node=#13 tag=anonymous box=anon
content: (0, 0, 19.418503, 16)
padding: 0 0 0 0
border: 0 0 0 0
margin: 0 0 0 0
text: "Full"
LayoutBox node=#15 tag=div box=block
content: (50, 30, 250, 25)
padding: 0 0 0 0
border: 0 0 0 0
margin: 0 0 0 0
inline_context: 1 lines, height=19.2, max_width=46.249626
line[0]: rect=(50, 30, 46.249626, 19.2) fragments=2
frag[0]: rect=(50, 30, 22.613804, 16) text="Last" start=false end=false
frag[1]: rect=(75.66813, 30, 20.581497, 16) text="two" start=false end=false
LayoutBox node=#16 tag=anonymous box=anon
content: (0, 0, 46.249638, 16)
padding: 0 0 0 0
border: 0 0 0 0
margin: 0 0 0 0
text: "Last two"