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Re: Consistent face for keys in *Help* and `substitute-command-keys'

From: Stefan Kangas
Subject: Re: Consistent face for keys in *Help* and `substitute-command-keys'
Date: Sat, 6 Mar 2021 22:03:05 -0500

Eli Zaretskii <eliz@gnu.org> writes:

> Thanks, I see only minor nits, this can go in once they are taken care
> of.

Thank you for reviewing the patch.

>> +*** Keybindings in 'help-mode' use the new `help-key-binding' face.
> I think this should mention substitute-command-keys, and say that any
> text that is run through that function will be propertized.  I'd also
> mention the effect on tooltips there.

How about this:

*** Keybindings in 'help-mode' use the new 'help-key-binding' face.
This face is added by 'substitute-command-keys' to any "\[command]"
substitution.  The return value of that function should consequently
be assumed to be a propertized string.

Note that the new face will also be used in tooltips.  When using the
GTK toolkit, this is only true if 'x-gtk-use-system-tooltips' is t.

>> --- a/lisp/help.el
>> +++ b/lisp/help.el
>> @@ -104,8 +104,8 @@ help-map
>>      (define-key map "R" 'info-display-manual)
>>      (define-key map "s" 'describe-syntax)
>>      (define-key map "t" 'help-with-tutorial)
>> -    (define-key map "w" 'where-is)
>>      (define-key map "v" 'describe-variable)
>> +    (define-key map "w" 'where-is)
>>      (define-key map "q" 'help-quit)
> Why the change in the order?

It's just to make them alphabetical.  If it is too minor, I can leave it

>> +                        (insert (propertize "M-x "
>> +                                            'face 'help-key-binding
>> +                                            'font-lock-face 
>> 'help-key-binding))
> Why are we fontifying "M-x" here?

I understand "M-x" to be part of the keybinding for that command, so I
think it makes sense to use the same face for that part too.  IOW,
rather than fontifying only "apropos" in "M-x apropos" we fontify the
whole string.

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