bug#66806: 30.0.50; [PATCH] 'project-find-regexp' passes Git submodules to the search program

[Jim Porter]

On 10/29/2023 2:41 PM, Dmitry Gutov wrote:
> And that's not to mention usage over Tramp (which would be affected by 
> the +1 process call that you mentioned as well, but that seems 
> unavoidable).

Yeah, I don't see a way around that, unless we constructed a complex 
command to run via Tramp that does it all in one go.

(I looked into using the "--stage" argument for "git ls-files", which 
gets most of the way to fixing this, but you could break that logic with 
evil file names not in the tree...)

> Anyway, after recent experience micro-optimizing list operations, I came 
> up with this version where the impact seems minimal.
>
> WDYT?

Thanks, that helped form the basis for the attached patch. It moves the 
'member' call into the lambda for the original 'mapcar', and then we can 
just 'delq' all the nil elements. Benchmarking against the Emacs repo, 
this still seems to have a minimal perf impact.

There might also be a benefit to using "git ls-files 
--recurse-submodules" when we can (i.e. when not using "-o"), but maybe 
we can leave that optimization for another day.

0001-Exclude-Git-submodules-from-project-files.patch
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