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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.

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