bug#55977: 29.0.50; [PATCH] repeat-mode: Don't echo unset keys in help message

[Juri Linkov]

close 55977 29.0.50
thanks

>>>> repeat-mode echoes unset keys in the help message since it doesn't check
>>>> for non-nil value of command bound to key; will attach patch once I get
>>>> the bug number.
>>>
>>> Thanks, but can you please show a recipe from "emacs -Q", to
>>> understand better what problem are you trying to fix?
>>
>> Sure.
>>
>>     1. M-x repeat-mode RET.
>>     2. C-h n.
>>     3. M-: (define-key outline-navigation-repeat-map (kbd "C-n") nil).
>>     4. C-c @ C-n.  Notice how the help message still says C-n despite
>>        being unbound, and when you type C-n the repeat map exits
>>        contrary to what the message says.
>
> Oh, looks like if I give `define-key' a non-nil REMOVE argument, then
> C-n is no longer displayed in the help message.

Indeed, the REMOVE removes a key, but nil is also a valid way to undefine a key,
so now your patch is pushed to master, thanks.