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cd1ea342ae
Display math (`$$…$$`, `\[…\]`) renders as several 2D rows: numerator,
fraction bar and denominator are separate lines. When the layout was
wider than the Markdown content width, `render()` wrapped each row with
`wrapTextWithAnsi` on its own. Only the overflowing row broke, so the
rows below moved down and the equation no longer lined up. For example,
`dx` landed between the fraction bar and the denominators.
The `latexBlock` case in `Markdown.renderToken()` now checks the
rendered layout against the available width. If any row is too wide, it
uses the raw LaTeX source, the same fallback already used when parsing
fails. The raw source then wraps like normal text. Layouts that fit
render exactly as before.
**Testing**
- Added a regression test in `packages/tui/test/markdown.test.ts` using
the equation from the issue. At width 40 it renders the 2D layout
unchanged. At width 30 it falls back to the raw `\[ … \]` source, with
no fraction bars and no line wider than 30. The test fails without the
fix and passes with it.
- `node --test test/markdown.test.ts`: 93 pass. `node --test
test/latex.test.ts`: 111 pass.
- `npm run check` reports no errors in the touched files. The only
errors are 6 type errors in `packages/ai/test`, caused by stale
generated model data, and they are the same on `main` without this
change.
- Reproduction at width 30, before the fix:
```
∂² u ∂² u n 1 1
──── + ──── = ∑ ── +∫ f(x)
dx
∂ x² ∂ y² i=1 i² 0
```
After the fix, the raw source, wrapped:
```
\[
\frac{\partial^2 u}{\partial
x^2} + \frac{\partial^2
...
\]
```
Fixes #11483
Requested by @badlogic
Co-authored-by: triagent <triagent@localhost>
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