Math rendering already shipped (both the $…$ shorthand and the spec
data-mx-maths form render incoming). But the composer emitted no math, so a
Lotus user's $E=mc^2$ went out as raw text — it rendered on Lotus (both sides
parse $…$) but showed as literal text on Element and other clients.
toMatrixCustomHTML now converts $…$/$$…$$ to
<span|div data-mx-maths="LATEX"><code>LATEX</code></span|div>
(spec CS-API §11.5), reusing the existing splitMathSegments parser. Math is
extracted BEFORE markdown so LaTeX (_, *, \, {}) isn't mangled, and the emitted
span survives the block-markdown pass via the existing ignoreHTMLParseInlineMD
HTML-tag guard. A new allowMath opt threads through the top-level call sites;
code-line/code-block paths use empty opts so math is off inside code. The plain
body keeps literal $…$ as the fallback.
Scope: inline $…$ + single-line $$…$$. Multi-line block $$ (spans editor
paragraph nodes) deferred — still renders on Lotus via the plain-body path.
New output.test.ts (8 cases): span/div emission, escaping, markdown-bypass,
currency non-match, code-mark + code-block exclusion. 738 tests pass.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
jared
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