Wiki.js uses markdown-it-attrs which interprets curly braces inside
inline math ($...$) as attribute directives, stripping them from the
formula. Additionally, markdown table parsers split cells at both `|`
and `&` characters, breaking formulas containing those symbols.
This fix replaces `{`, `}`, `|`, and `&` inside math expressions with
Unicode Private Use Area placeholders during markdown parsing, then
restores them before passing to KaTeX/MathJax for rendering.
- `<E000>` / `<E001>`: temporary replacements for `{` / `}`
- `<E002>`: temporary replacement for `|` (table cell delimiter)
- `<E003>`: temporary replacement for `&` (table cell delimiter in
multiline tables, used by LaTeX cases/arrays)
The placeholder approach was chosen over HTML escaping because it
preserves LaTeX environments like `\begin{array}` that were broken
by the previous `{{}}` escaping method.
Fixes#1581Fixes#1462
Co-authored-by: Claude <noreply@anthropic.com>
AI-model: kimi-for-coding/k2p6
Hugo Gu
b41c9cd4e9