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Re: diff-goto-source hi-jacks my M-o

From: Dmitry Alexandrov
Subject: Re: diff-goto-source hi-jacks my M-o
Date: Tue, 07 Jul 2020 00:46:49 +0300
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

Tomas Nordin <> wrote:
> Dmitry Alexandrov <> writes:
>> I am not sure, what ‘dummy’ is supposed to mean here?  Minor mode is fully 
>> functional, that is you are free to disable and reenable it at will:
> I think I sort of tried to be funny, based on that the mode was made up just 
> to keep a key binding available in all situations.

No, itʼs not required there, you are free to enable ‘my-precious-keys-map’ 
unconditionally as well:

        (add-to-list 'emulation-mode-map-alists
                     (list (cons t my-precious-keys-map)))

if you feel that you will never need to suspend it.

> And that the trickery with the key-maps is hard to follow for me.

There is no any trickery, just a hardcoded priority order in Emacs itself: 
global map is overridden by major mode map, which in turn is overridden by 
minor mode maps, which can be overridden by emulation mode maps.

That is, using a minor mode map would suffice in your specific case — about M-o 
in diff-mode.  But so would a mere:

        (with-eval-after-load 'diff-mode
          (define-key diff-mode-map
            (kbd "M-o") nil)) ; also on RET, o, C-c C-c, which is more than 

> I got the impression that it sufficed to evaluate the forms, I mean, I didn't 
> say, M-x my-precious-keys-mode .

>>>>    (define-minor-mode my-precious-keys-mode "" t)

| (define-minor-mode MODE DOC &optional INIT-VALUE LIGHTER KEYMAP &rest BODY)
| ‹…›
| Optional INIT-VALUE is the initial value of the mode’s variable.

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