suggestion: complete first and go

Hi again!

I'm finding myself using all the time this little command (which i bind to C-RET in mct-minibuffer-local-completion-map):

      (defun jao-mct-complete-and-go ()
        "Complete current input, as with `M-e', and accept the candidate."
        (interactive)
        (mct-edit-completion)
        (exit-minibuffer))

In my usage at least, it happens all the time that i narrow to put the first candidate first very quickly, and that comes in handy. Admittedly, there's just a single keystroke from the functionally equivalent C-n RET sequence, but for some reason a single action feels much better in my case. So maybe it's just me, but maybe other people would like to see it there (or mentioned in an issue when they google).

Cheers, jao

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