re-create md/notes editor iframe when navigating

[kevodwyer]

The fix was done as mathJAX was erroring when initialised more then once on the same page

[ianopolous]

I'd like to understand the consequences of this. Do resizes not work now? Is it slower to navigate to md links? Is there no way to catch the mathjax error? What about not showing the not found error?

[kevodwyer]

I'd like to understand the consequences of this.
Do resizes not work now?
Yes resize works fine. Not an issue

Is it slower to navigate to md links?
No noticeable slow down

Is there no way to catch the mathjax error?
No. Also wouldn't help as that is a symptom not the cause.

What about not showing the not found error?
that was an existing issue that is now fixed