fix: preserve all markup boundaries only except special list cases

[QuadnucYard]

Summary

Resolves #464.

Related: #356 (comment)

Changes

• Now all markup boundary kinds are preserved for the correct evaluation result, except the special case described below.

Checklist

Before submitting, please ensure you've done the following:

• Updated CHANGELOG.md: Added your changes with examples to the changelog
• Updated documentation: Updated relevant docs, examples, or README
• Added tests: Added tests for new features or bug fixes

Testing

We might need a powerful fuzzer to generate stronger inputs than this:

  - first line
 - second line #[ - A
- B
 - - / C:
  - D #[/ a: b
          / c: d
      / #[/ e: f]:
    /   g:
      #[/ h:
      i
    / j:]]
- E
   + + F
    + G
  + H]

Additional Notes

SPECIAL CASE: Force line break before first list/enum/term item in content blocks.

PROBLEM: In Typst, there are no "list" nodes - only individual list/enum/term item nodes.
The compiler groups items using indentation levels. When multiple items exist and the
first item appears on the first line without a preceding break, subsequent items lose
proper alignment because indentation becomes inconsistent.

SOLUTION: Force a line break before the first item when:

• Markup contains multiple list/enum/term items
• First line contains one such item
• We're in a ContentBlock scope (avoids affecting nested items)

LIMITATION: This changes evaluation semantics by adding line breaks where none existed.
Without this fix, formatted code would break item hierarchy and cause incorrect rendering.

[github-actions]

📊 Benchmark Performance Report

group                               base                                   pr
-----                               ----                                   --
pretty-ai-comprehensive-showcase    1.00   879.6±15.17µs        ? ?/sec    1.00    878.1±9.81µs        ? ?/sec
pretty-cetz-manual                  1.00   745.5±19.69µs        ? ?/sec    1.00   744.2±13.98µs        ? ?/sec
pretty-codly                        1.00  1754.7±20.44µs        ? ?/sec    1.00  1749.1±29.98µs        ? ?/sec
pretty-cpe                          1.00     13.0±1.39ms        ? ?/sec    1.00     13.0±0.82ms        ? ?/sec
pretty-deep-nested-args             1.01     16.9±0.33µs        ? ?/sec    1.00     16.8±0.61µs        ? ?/sec
pretty-fletcher-diagram             1.00    510.6±5.06µs        ? ?/sec    1.01    513.4±6.34µs        ? ?/sec
pretty-fletcher-draw                1.00  1228.9±24.42µs        ? ?/sec    1.01   1240.1±9.70µs        ? ?/sec
pretty-tablex                       1.00      3.3±0.01ms        ? ?/sec    1.01      3.3±0.02ms        ? ?/sec
pretty-touying-core                 1.01      2.1±0.03ms        ? ?/sec    1.00      2.1±0.01ms        ? ?/sec
pretty-touying-utils                1.01  1183.0±29.67µs        ? ?/sec    1.00  1174.5±22.37µs        ? ?/sec
pretty-undergraduate-math           1.00   850.2±32.21µs        ? ?/sec    1.01   860.2±58.77µs        ? ?/sec

📏 Binary Size Comparison

Metric	Base	PR	Change
File Size	5.8 MB	5.8 MB	📈 +1.1 kB (+0.02%)
Text Section	1.3 MB	1.3 MB	📈 +784 B (+0.06%)

📦 Detailed Crate Size Diff (cargo-bloat)

Note: Numbers above are a result of guesswork. They are not 100% correct and never will be.

@@ -1,8 +1,8 @@
 std                       394.6 kB
 clap_builder              323.0 kB
-typstyle_core             203.4 kB
+typstyle_core             204.1 kB
 clap_complete             126.4 kB
 typst_syntax              116.3 kB
 similar                   73.9 kB
 typstyle                  40.2 kB
 walkdir                   19.1 kB

Generated by GitHub Actions on 2026-01-29 03:49:52 UTC

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