Graphical Glitch with `esc` and Advanced Markdown Edtior

[DarkArc]

If while editing inside of the advanced markdown editor, you press escape, you get a graphical glitch -- padding and a border radius appear -- that persists until the editor is reloaded (switching to another editor like spreadsheets and then back).

[moughxyz]

I believe this is the editor exiting and entering out of its built-in "full screen mode", which is a feature not applicable to its contained usage within our application. We'll have to see if there's a way to disable it.

[alandooz]

Maybe a #24 duplicated?