Due to the "in mind" part it took me a while to realize
that your patch is already available ...

Looks good to me and seems to work as expected (on FreeBSD with
gpa 0.9.4, I didn't try with git master). Thanks a lot.

I suspect that (outside the GNU project) ".asc" is more common than
".sig" and would thus sort and check the extensions in alphabetical
order, but obviously it doesn't really matter and I have no data to
support my theory anyway.

As it turns out the patch also prevents false negatives when
using the "verify" button on the signature file instead of
the signed file.

A couple of screenshots:
http://www.fabiankeil.de/bilder/screenshots/patched-gpa/

D195: 431_gpa-0.94-Let-is_detached_sig-detect-potential-asc-signatures.diff

Works for me, thanks.

Quoting my gnupg-devel mail:

D147: 331_gnupg-2.0.17-Do-not-lock-the-es_list-when-flushing-it-from-es_dei.patch