bug#48471: 28.0.50; Incorrect handling of `project-ignores' on macOS (BSD find?) if project root is a directory name

[Philipp]

> Am 18.05.2021 um 01:06 schrieb Dmitry Gutov <dgutov@yandex.ru>:
> 
> On 17.05.2021 23:02, Philipp wrote:
>> The attached patch fixes both unit tests for project.el on my macOS system.
> 
> Thanks, now I think I understand the problem. And you're suggesting the 
> alternative solution also proposed previously in the 
> https://lists.gnu.org/archive/html/emacs-devel/2021-01/msg00156.html 
> discussion.
> 
> Please go ahead with the patch,

Thanks, I've installed the patch as commit 
2e55201b8085d64c76d9a35bffff90a02133647e.

> though it would be better to use a version of it which fixes the same 
> behavior in two other related functions as well. The previous patch for that 
> approach is here: 
> https://lists.gnu.org/archive/html/emacs-devel/2021-01/txtDduOxGoiGz.txt
> 
> (From the message 
> https://lists.gnu.org/archive/html/emacs-devel/2021-01/msg00345.html).
> 
> Also, since it will fix the double-slash problem, we can undo the change from 
> 331e40a8fd491ceb35c08a3345785dab61bc60d9, the one that made our comparisons 
> lax (to match both single and double slashes).

I'm also fine with either of those, but we should first make sure that the code 
in question is well-covered by unit tests to avoid regressions.