Anki 2.1.55 Beta, MathJax Preview

[pwintz]

@pwintz

The first time I clicked “Toggle MathJax Rendering,” nothing happened, but from then on it correctly toggled (I haven’t been able to reproduce it). Also, I think the settings gear

would be a more logical place to put the toggle option. Perhaps also display a checkbox as is the case for “Shrink Images” so that users can see what the current setting is

Copied from Anki 2.1.55 Beta 1-2.