Also, I'd vote for this being a core feature
I second this, in my opinion this is a long missing feature in Joplin. I am aware there are valid reasons why this hasn't been implemented yet, but to me it should be implemented as a core feature, anything else would feel as a sort of a hack. Not that having such hack would be bad, it's just that it'd looked like a half-baked solution 
Anyway, thanks as always for Joplin <3