Allow sorting by negative numbers

[dsschult]

One of my users noticed that negative numbers specified in meta ordering weren't being sorted correctly. This adds ns.SIGNED to the sorting, as well as modifying the tests to show it works.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (943d77c) 88.70% compared to head (1c2cb06) 88.72%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #507      +/-   ##
==========================================
+ Coverage   88.70%   88.72%   +0.02%     
==========================================
  Files          25       25              
  Lines        2062     2066       +4     
==========================================
+ Hits         1829     1833       +4     
  Misses        233      233              

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[saimn]

Thanks for the patch, just a little question.

[saimn]

The PartialOrder key doesn't seem to be used ?

[dsschult]

If you don't set that, then the PartialOrder test fails:

        settings["albums_sort_reverse"] = False
        a = Album("dir1", settings, album["subdirs"], album["medias"], gal)
        a.sort_subdirs(["meta.partialorder", "meta.order"])
>       assert [d.name for d in a.albums] == list(["test1", "test2", "test3"])
E       AssertionError: assert ['test2', 'test1', 'test3'] == ['test1', 'test2', 'test3']
E         At index 0 diff: 'test2' != 'test1'
E         Use -v to get more diff

tests/test_gallery.py:251: AssertionError

I suppose I could have reordered the test assertion, but it's a good check that it's using PartialOrder instead of Order.

[saimn]

Oh right, I missed that !
Sounds good them, thanks again.