Feature Request/Question: Allow to lock the preview to a file

[AndrassGray]

Great plugin, thanks!

I'd like to see one feature: I do use includes to structure my mjml files, and more often than not, they don't preview well or at all. No surprise.

What I would like to do is lock the preview to a master-file (which has the ), and then go and edit the include-file. And watch the effects of changes in the include-file on the master-file.

As it works now, I go the the include, make changes, go back to the master, see what my changes did, go back to the include ...

Thanks for considering such a feature. I can live without, or find a different workflow, but that would add a level of comfort.