Variable: completion-preview-sort-function
completion-preview-sort-function is a variable defined in
completion-preview.el.gz.
Value
minibuffer--sort-by-length-alpha
Documentation
Sort function to use for choosing a completion candidate to preview.
Source Code
;; Defined in /usr/src/emacs/lisp/completion-preview.el.gz
(defvar completion-preview-sort-function #'minibuffer--sort-by-length-alpha
"Sort function to use for choosing a completion candidate to preview.")