crm--choose-completion-string
crm--choose-completion-string is a compiled Lisp function in `crm.el
'.
(crm--choose-completion-string CHOICE BUFFER BASE-POSITION &rest IGNORED)
Completion string chooser for `completing-read-multiple'.
This is called from `choose-completion-string-functions'.
It replaces the string that is currently being completed, without
exiting the minibuffer.