Fix min_size and collapsed handling on <H|V>Split

[philippjfr]

Fixes #11
Fixes #13
Fixes #15
Fixes #16

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.00%. Comparing base (6513427) to head (8b9b9a2).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #18   +/-   ##
=======================================
  Coverage   86.00%   86.00%           
=======================================
  Files           3        3           
  Lines         100      100           
=======================================
  Hits           86       86           
  Misses         14       14           

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