Improve editor loop / allow dropping straight into the editor

[aJanuary]

Is your feature request related to a problem? Please describe.
I have a workflow where I drop the user into an editor, then show a rendered preview when they exit, and ask them if they want to write that to the default location, pick where they write it, or edit the text.

This sort of workflow isn't really possible with the current editor implementation. This means I have to build it myself.

Describe the solution you'd like
The ideal for me would be if the editor could show a rendered preview before asking if they want to edit it.

However, in the absence of that, just being able to use Inquire to drop them straight into the editor would be really useful. Currently I have to write all the code to write the temporary file, pick the appropriate editor, read back from the temporary file, and handle errors myself. However, I know all of that code exists inside the editor, so it would be nice to be able to just reuse that.