[HarryCordewener]

Requested by Grave · project thread

The default rule under a table's headings (LayoutTheme.Defaults.HeaderRule) was a plain -. Since it is already ASCII, nothing folded it, so a UTF-8 reader saw ----- under the headings and ───── in the rules and boxes around the table. In SharpMUSH this shows up in datatable(), ldatatable() and datacolumns().

• Table with no rule of its own and none from the theme now draws ─, or - when the border it sits among is ASCII (context.Border(null).IsAscii). That covers an ASCII reader too, since their border is folded first.
• A rule the table or the theme names still wins as written.
• LayoutTheme.Defaults.HeaderRule is ─.

Tests: 7 expectations that a Unicode reader gets - now expect ─. New Table_HeaderRule_FollowsTheBorder covers a Unicode reader, an ASCII reader, an ASCII border and an ASCII border with a theme rule. All 1385 pass locally.

SharpMUSH needs a tag for this (v2.24.2) before it can bump MarkupStringVersion. I checked a local 2.24.2 pack against SharpMUSH's tests and a running server; that bump will be its own PR.

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Generated by Claude Code

Summary by CodeRabbit

• Bug Fixes
  • Table heading rules now use a Unicode line (─) by default, matching the active theme. ASCII-only output and ASCII border themes continue to use a hyphen (-), and custom heading rules remain supported.
• Documentation
  • Updated the table layout example and guidance to reflect the default heading rule and its ASCII fallback.

[coderabbitai]

Walkthrough

Table heading rules now default to the theme’s Unicode horizontal line (─). When the table and theme leave the rule unset, ASCII borders use -. Tests and documentation reflect these defaults.

Changes

Table Header Rule Defaults

Layer / File(s)	Summary
Default rule selection and validation MarkupString/Layout/Blocks/Block.cs, MarkupString/Layout/Blocks/Table.cs, MarkupString.Tests/Layout/*, docs/layout.md, CHANGELOG.md	The theme default changes to ─. Table rendering uses - for ASCII borders when no table or theme rule is set. Tests and documentation cover the default, ASCII output, and custom rules.

Priority: Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

Suggested reviewers: claude

Merge Risk: Low · up to 5575a

Explicit ASCII-framed tables can show inconsistent header borders; correct the fallback before merging.

Pre-merge checks: 5

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main change: table heading rules now follow the border style, using ─ by default and - for ASCII borders.
Docstring Coverage		Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentat…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

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Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 2 functions across 4 files. (2 skipped: 2 unsupported.)

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Actionable comments posted: 1

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• 🪄 Fix comments: Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @MarkupString/Layout/Blocks/Table.cs:
- Line 111: Update the table header-rule fallback in the table layout to use the
effective enclosing frame border rather than only context.Border(null), so an
explicit ASCII border selected by Frame.Draw produces a matching ASCII rule. Add
a test covering a table inside a frame with an explicit border.

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Commits

Reviewing files that changed from the base of the PR and between 3e2f34d and 5575a1f.

Files selected for processing: 6

• CHANGELOG.md
• MarkupString.Tests/Layout/CompositionTests.cs
• MarkupString.Tests/Layout/WidgetLayoutTests.cs
• MarkupString/Layout/Blocks/Block.cs
• MarkupString/Layout/Blocks/Table.cs
• docs/layout.md

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