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I am on gnu emacs 26.3 linux mint 20.1 and since my last OS update I cannot attach multiple files via dired using the key-binding C-c RET C-a. The message buffer indicates that C-c <return> C-a is undefined. Strangely, the supposedly equivalent C-c C-m C-a does work. Is there any way to debug what is happening? To be clear, I have a message and dired buffers open, I mark some files on dired, and hit C-c RET C-a, but the files do not get attached to the message buffer.

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  • C-m is the same as RET, but it is not necessarily the same as <return>. A guess is that C-h k followed by your hitting the Return key shows you <return>. You may have to explicitly add a key binding for that <return> function key in the given mode map.
    – Drew
    Commented Jan 22, 2021 at 23:16
  • If you discover that the problem is in fact a difference between <return> and RET (aka C-m), then consider changing your question title to speak of <return> or "the Return key", and not of RET.
    – Drew
    Commented Jan 22, 2021 at 23:17
  • Output from C-h k + Return key is: RET (translated from <return>) runs the command dired-find-file (found in dired-mode-map), which is an interactive compiled Lisp function in ‘dired.el’. It is bound to RET, e..f, <menu-bar> <immediate> <find-file>.
    – Ajned
    Commented Jan 23, 2021 at 8:46
  • which means that RET and <return> are the same right?
    – Ajned
    Commented Jan 23, 2021 at 8:50
  • They're not the same (logical) key. What it means is that Emacs sees function key <return> when you hit the Return physical key, but since <return> has no key binding Emacs translates to RET and uses the binding for RET. Perhaps (dunno) such translation doesn't happen when RET is used as a prefix key, as in your example: C-c RET C-a. Perhaps (dunno) you need to add a specific binding for that, and define C-c <return> as a prefix key.
    – Drew
    Commented Jan 23, 2021 at 17:08

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Well...this solution works. The question still lingers though, over why this happened in the first place. Thank you @Drew

(global-set-key (kbd "C-c <return> C-a") 'gnus-dired-attach)

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