bug#46621: [External] : bug#46621: Copy line

[Drew Adams]

> I can't prove if such convention of 'C-c letter' for
> user keys really exists, I can't find it in the manual.

In the Elisp manual, `i key bind TAB':

 key binding
 key binding, conventions for

Or `i conven TAB': (with substring matching):

 buffer display conventions
 coding conventions in Emacs Lisp 
 comments, Lisp convention for
 conventions for writing major modes 
 conventions for writing minor modes
 documentation conventions 
 documentation strings, conventions and tips
 key binding, conventions for 
 major mode conventions
 minor mode conventions 
 programming conventions
 set-advertised-calling-convention 
 typographic conventions

(Yet another advertisement for completion candidates
as an aid to discovery.)

Candidate `key binding, conventions for' takes you
to node `Key Binding Conventions', where you find
this, among other conventions:

  Don't define 'C-c LETTER' as a key in Lisp programs.
  Sequences consisting of 'C-c' and a letter (either
  upper or lower case) are reserved for users; they
  are the *only* sequences reserved for users, so do
  not block them.