Add test case for interdiff color context trimming issue #119

[twaugh]

Assisted-by: Cursor

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.59%. Comparing base (ecb9554) to head (9eb05d3).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #121      +/-   ##
==========================================
+ Coverage   82.39%   82.59%   +0.19%     
==========================================
  Files           5        5              
  Lines        4130     4130              
  Branches      983      984       +1     
==========================================
+ Hits         3403     3411       +8     
+ Misses        727      719       -8     

Flag	Coverage Δ
unittests	82.59% <ø> (+0.19%)	⬆️

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