show abbreviations on set-buffer-file-coding-system

[Dan Jacobson]

You know what might be handy when we are interacting with
set-buffer-file-coding-system,

   Click <mouse-2> on a completion to select it.
   In this buffer, type RET to select the completion near point.

   Possible completions are:
   japanese-iso-7bit-1978-irv      japanese-iso-7bit-1978-irv-dos
   japanese-iso-7bit-1978-irv-mac          japanese-iso-7bit-1978-irv-unix
   japanese-iso-8bit               japanese-iso-8bit-dos
   japanese-iso-8bit-mac                   japanese-iso-8bit-unix
   japanese-iso-8bit-with-esc      japanese-iso-8bit-with-esc-dos
   japanese-iso-8bit-with-esc-mac          japanese-iso-8bit-with-esc-unix
   japanese-shift-jis              japanese-shift-jis-dos
   japanese-shift-jis-mac                  japanese-shift-jis-unix

if we could see alongside them the familiar letter that gets put in
the modeline, instead of having to check elsewhere, for say, which one
gets us in the mode abbreviated "J".
-- 
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