[TeX input] \class is lost during input [was "\class" being ignored in "\left[\class{test}{\sin(x)}\right]"]

[TomasRiker]

In \left[\class{test}{\sin(x)}\right], the \class is ignored.

When replacing \sin(x) with e.g. x^2, it works. It also works when removing the \left[ and \right] around the expression.

See this screenshot (the test class is just defined to be color: red):

[pkra]

Thanks for the report. I can confirm this.

It looks like the TeX input processor is losing the class.

[dpvc]

This turns out to be due to this line in the TeX input jax, which unwraps an mrow when it adds fences to it. In this case, the class was attached to the mrow. The code should not unwrap the mrow, but just leave it as it is, even though most of the time it will be unnecessary.

[dpvc]

The issue1415 branch of my fork of MathJax resolves this issue.

[dpvc]

==> Merged.

[dpvc]

==> In testsuite

LaTeXToMathML/delimiters/issue1415.html