bug#59888: [PATCH] Add 'grep-heading-mode'

[Augusto Stoffel]

On Fri,  9 Dec 2022 at 09:28, Juri Linkov wrote:

>> +(defface grep-heading '((t :inherit font-lock-function-name-face))
>> +  "Face of headings when using `grep-heading-mode'.")
>
> I suggest to keep the existing color scheme, thus inheriting from
> compilation-info.  This is the same color used by both grep.el and
> xref.el by default.

Yes, I came to the same conclusion in the meanwhile.

>> +(defvar grep--heading-format
>> +  #("\n%s\n" 1 3 (font-lock-face grep-heading outline-level 1))
>
> xref.el doesn't insert extra newlines between file sections.
> It would be nice to keep the output closer to the existing
> output in xref buffers.

Okay, I agree with your reasoning and will make the change.  However, I
must say find the result less appealing.  Note that, because of the lack
of newlines, xref-file-header was naturally chosen as a heavier face.

But it's all customizable anyway.