Support :set prompt-function with -fexternal-interpreter
Motivation
-fexternal-interpreter doesn’t support :set prompt-function, but prompt-function lets me have a beautiful multiline prompt that is really difficult to reproduce without it, even with %call(). I didn’t see this filed anywhere else or even documented as a limitation of -fexternal-interpreter so I figured it was worth filing.
Proposal
I would like to be able to use :set prompt-function with -fexternal-interpreter.