Re: master 12409c9: New transient mode 'repeat-mode' to allow shorter key sequences (bug#46515)

[Juri Linkov]

>>>> +(defvar next-error-repeat-map
>>>> +  (let ((map (make-sparse-keymap)))
>>>> +    (define-key map    "n" 'next-error)
>>>> +    (define-key map "\M-n" 'next-error)
>>>> +    (define-key map    "p" 'previous-error)
>>>> +    (define-key map "\M-p" 'previous-error)
>>>> +    map)
>>>> +  "Keymap to repeat next-error key sequences.  Used in `repeat-mode'.")
>>>> +(put 'next-error 'repeat-map 'next-error-repeat-map)
>>>> +(put 'previous-error 'repeat-map 'next-error-repeat-map)
>>>
>>> Could we avoid this duplication between the map and the
>>> `repeat-map` property?
>
> There is in the above code snippet: the `put` statements are redundant
> since the same info is fundamentally already available from
> `next-error-repeat-map`.

Now I see where is duplication.  But currently I have no idea
in what keymaps post-command-hook should look for keybindings.

When a command is associated with a keymap `next-error-repeat-map`
via `put` property, then post-command-hook knows where to look
for keybindings for the current command (using `this-command`).