bug#59575: 29.0.50; add-log-current-defun-header-regexp matches Windows drive letter

[Eli Zaretskii]

> Date: Sun, 27 Nov 2022 03:54:27 +0200
> Cc: 59575@debbugs.gnu.org
> From: Dmitry Gutov <dgutov@yandex.ru>
> 
> On 26/11/22 15:03, Eli Zaretskii wrote:
> > It is also possible to have xref.el define its customized
> > add-log-current-defun-function, but that sounds like overkill to me.
> > Dmitry, WDYT?
> 
> It seems like
> 
>    (setq add-log-current-defun-function nil)
> 
> should suffice.

The value is already nil in the *xref* buffer, so I'm unsure how will the
above help.