one-character macros inside \text{}

Created by: Alex-Jordan

I discovered the following with the percent sign in an MBX project. I investigated a little and the issue extends to other characters.

With:

$\text{\&}$
$\text{\%}$
$\text{\#}$
$\text{\_}$
$\text{\{}$
$\text{\}}$
$\text{\$}$

the first four render with the backslash present (as in they appear like \% instead of just %). The last three do not, which is the right behavior. I checked that a LaTeX document will render all of these without the backslash. I did my MathJax testing at math.se.