Fix markdown go blank issue

@samccone, I made some change on top of your change that seems to have address the scope/editor mismatching causing editor go blank or wrong focus issue. I am still seeing the whitespace growing though. Please review and see if it makes sense to merge into your branch.
ahhhh this was it, we were not unbinding 
good catch @anglee 

I was under the impression that since we were initing a new editor we would be ok, but alas I guess not!

great catch