use min_time to allow negative times in ts

[hyanwong]

Fixes #2197

[codecov]

Codecov Report

Merging #2215 (2ea6dd0) into main (f4b8dcb) will decrease coverage by 0.00%.
The diff coverage is 98.66%.

@@            Coverage Diff             @@
##             main    #2215      +/-   ##
==========================================
- Coverage   93.28%   93.27%   -0.01%     
==========================================
  Files          28       28              
  Lines       26385    26425      +40     
  Branches     1188     1196       +8     
==========================================
+ Hits        24612    24649      +37     
- Misses       1743     1744       +1     
- Partials       30       32       +2     

Flag	Coverage Δ
c-tests	92.30% <ø> (ø)
lwt-tests	89.05% <ø> (ø)
python-c-tests	71.52% <13.51%> (-0.14%)	⬇️
python-tests	98.85% <98.66%> (-0.05%)	⬇️

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Impacted Files	Coverage Δ
python/tskit/trees.py	98.14% <ø> (ø)
python/tskit/drawing.py	99.17% <98.66%> (-0.26%)	⬇️

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[benjeffery]

LGTM! Thanks @hyanwong.

[jeromekelleher]

LGTM, spotted a few small issues and some structuring suggestions.

[jeromekelleher]

is this ready to go @hyanwong ?

[hyanwong]

I made the changes you suggested, so yes, I think so.