bug#50733: 28.0.1; project-find-regexp can block Emacs for a long time

[Eli Zaretskii]

> Date: Fri, 24 Sep 2021 16:24:50 +0000
> From: Gregory Heytings <gregory@heytings.org>
> cc: 50733@debbugs.gnu.org, dgutov@yandex.ru, mardani29@yahoo.es
> 
> > Look closer at those matches which gid "missed", and you will see why it 
> > didn't show them to you.
> 
> I looked close (before you asked), and no, I don't see why some matches 
> are not included.  For example it returns
> 
> lib/tempname.c:212: __GT_FILE: create the file using open(O_CREAT|O_EXCL)
> 
> but not
> 
> lib/tempname.h:47: GT_FILE: create a large file using open(O_CREAT|O_EXCL)
> 
> and it returns
> 
> lib/open.c:99: /* Fail if one of O_CREAT, O_WRONLY, O_RDWR is specified and 
> the filename
> 
> but not
> 
> lisp/gnus/nnmaildir.el:387: ;; If Emacs had O_CREAT|O_EXCL, we could return 
> number-open here.

Hint: they are all in comments.