GitLab

(coding-system-lessp): New function.
(coding-system-list): Sort coding systems by coding-system-lessp.
An element of returned list is always coing system, never be a
cons.
(modify-coding-system-alist): Renamed from
set-coding-system-alist.
(prefer-coding-system): New function.
(compose-chars-component): But fix for handling a composite
character of no compositon rule.