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fix: space should prevent optional argument to \\ (#3746)

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Fix `src/functions/cr.js`'s definition of `\\` to manually look for an
optional argument via `future()` instead of `numOptionalArgs`, so that
it does *not* skip over spaces.  This matches the existing behavior of
`\\` in `src/environments/array.js` and AMSMath's behavior of `\math@cr`
via `\new@ifnextchar`.

Fixes #3745

Co-authored-by: Ron Kok <ronkok@comcast.net>
This commit is contained in:
Erik Demaine
2022-12-07 18:01:07 -05:00
committed by GitHub
parent 3db8e34719
commit a0deb3410f
2 changed files with 8 additions and 3 deletions
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5
test/katex-spec.js
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@@ -1309,6 +1309,11 @@ describe("A begin/end parser", function() {
expect`\begin{matrix}a&b\cr[c]&d\end{matrix}`.toParse();
});
it("should not treat [ after space as optional argument to \\\\", function() {
expect`\begin{matrix}a&b\\ [c]&d\end{matrix}`.toParse();
expect`a\\ [b]`.toParse();
});
it("should eat a final newline", function() {
const m3 = getParsed`\begin{matrix}a&b\\ c&d \\ \end{matrix}`[0];
expect(m3.body).toHaveLength(2);