fix right align

[xav-ie]

Hello, this PR fixes #1322. I also added comprehensive tests verifying we agree on the expected behavior.

I encountered this error a lot randomly from a flaky test during development:

> make test-010
...
./test/gs_helpers.lua:275: status['added'] did not match gitsigns_status_dict
Expected objects to be the same.
Passed in:
(number) 1
Expected:
(number) 0

stack traceback:
        ./test/gs_helpers.lua:275: in function 'check_status'
        ./test/gs_helpers.lua:323: in function 'cond'
        ./test/gs_helpers.lua:125: in function 'expectf'
        ./test/gs_helpers.lua:321: in function 'check'
        test/gitsigns_spec.lua:685: in function <test/gitsigns_spec.lua:669>

I don't think this has anything to do with what I have done and wanted to bring this to your attention because I wasted many hours on this just to find it was just a flaky test :(. Or, maybe I just don't understand how the testing framework works. Either way, it was very difficult to know if I was introducing this error, because on re-run, it would go away!!! I think my tests are reasonable and don't do anything bad, but idk 🫠

It also happens randomly with 011:

> make test-011
...
======== 66 tests from 5 test files ran. (59153.33 ms total)
PASSED   65 tests.
FAILED   1 test, listed below:
FAILED   test/gitsigns_spec.lua @ 735: gitsigns (with screen) diff-ext can stages file with merge conflicts #46#
./test/gs_helpers.lua:269: b:gitsigns_head does not match
Expected objects to be the same.
Passed in:
(string) 'abranch'
Expected:
(string) 'HEAD(rebasing)'

stack traceback:
        ./test/gs_helpers.lua:269: in function 'check_status'
        ./test/gs_helpers.lua:323: in function 'cond'
        ./test/gs_helpers.lua:125: in function 'expectf'
        ./test/gs_helpers.lua:321: in function 'check'
        test/gitsigns_spec.lua:767: in function <test/gitsigns_spec.lua:735>


 1 FAILED TEST
E5113: Error while calling lua chunk:
make[1]: *** [Makefile:39: test] Error 1
make[1]: Leaving directory '/home/x/Projects/gitsigns.nvim'
make: *** [Makefile:55: test-011] Error 2

But then, on re-run, it works for 10 straight reruns or more! I have tried numerous strategies to re-write and refactor my tests but I just don't know what I am doing wrong. My code works and I just wanted to show that with a test, but spent 10x more on the test than the fix.

---

• feat(win_width): accept winid param

  This helps ensure we are getting the expected window width.

• test(handle_blame_info): verify right_align falls back to eol

• fix(handle_blame_info): do not consider wrap/nowrap for right_align/eol

  When calculating if a line should fall back to eol for very long lines,
  window wrapping should not be considered. This is because when window is
  nowrap, then the blame should still be eol.

  The idea of right_align option is to be nicely right aligned, but fall
  back to eol when there is not enough room. Long lines with nowrap will
  never have extra room, so they should also always fall back to eol
  mode.