Greptile Summary

This PR fixes a long-standing visual bug (#3142, #2911) where aligned, gathered, align, alignat, and similar AMS environments added an extra \jot (3 pt) of space after the last row, instead of only between rows. The fix is a one-line condition change in the HTML builder loop in src/environments/array.ts, and is accompanied by two targeted unit tests.

Key changes:

• src/environments/array.ts: The addJot depth increment now only fires for rows where r < group.body.length - 1, i.e. all rows except the last. This matches the LaTeX \openup semantics which add space between lines.
• test/katex-spec.ts: Two new tests verify the single-row case (with and without a trailing \\) and the two-row case against an equivalent matrix* baseline.

Notes:

• The MathML builder (line 593) is unaffected — MathML's rowspacing attribute already applies only between rows, so it was already correct.
• The existing screenshotter images for Align, Aligned, Alignedat, Gather, and Gathered will diverge from the new output; those baseline screenshots will need to be regenerated before screenshotter CI passes.

Confidence Score: 5/5

Safe to merge — the fix is minimal, correct, and well-tested; no logic regressions identified.

The core change is a single guard condition that is trivially correct for all row counts (0 jot on a single row, jot only between rows for N > 1). Both new tests validate the expected semantics. The only remaining items are a minor test-comment suggestion (P2) and the known need to regenerate screenshotter baselines, neither of which blocks correctness.

Screenshotter baseline images for Align, Aligned, Alignedat, Gather, and Gathered need regeneration after this change.

Important Files Changed

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["htmlBuilder loop\nfor r = 0 to body.length-1"] --> B["compute row height & depth\n(arstrut baseline)"]
    B --> C{"rowGap[r] set?"}
    C -- yes --> D["gap = calculateSize(rowGap)\nif gap > 0: depth = max(depth, arstrutDepth+gap)"]
    C -- no --> E["gap = 0"]
    D --> F
    E --> F{"group.addJot AND\nr < body.length - 1?"}
    F -- "yes (between rows)" --> G["depth += jot  ✅ space added"]
    F -- "no (last row)" --> H["depth unchanged  ✅ no extra space"]
    G --> I["totalHeight += height + depth + gap"]
    H --> I

_{Reviews (1): Last reviewed commit: "fix: remove extra \jot space at bottom o..." | Re-trigger Greptile}

Looks great!

🎉 This PR is included in version 0.16.44 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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