Mangled \divergence and \curl output

[stillyslalom]

Issue Summary

\divergence and \curl macros from the physics package produce mangled output if they're not the first items in a TeX field

Steps to Reproduce:

1. In a Pluto.jl Markdown environment, enter

md"""
``
\curl{u} = 0
``

``
0 = \curl{u}
``

``
\divergence{u} = 0
``

``
0 = \divergence{u}
``

"""

2. The following output is produced:
   

Technical details:

• MathJax Version: 3.1.2, tex-svg-full
• Client OS: Windows 10 insider build 20206.1000
• Browser: Chrome 85.0.4183.121

Supporting information:

https://gist.github.com/stillyslalom/6968cda032d8ffc25586bc1c008bcdfa

[zorkow]

Thanks for reporting this.
This seems to be a problem with the SVG output jax. The expressions render correctly with CHTML.
Likewise replacing \curl or \divergence with their underlying implementation (\gradientnabla\crossproduct and \gradientnabla\vdot, respectively) works fine. This will of course not give you automatic brackets or parentheses.

[dpvc]

I have made a pull request that resolves the issue.