fix: setShape does not overwrite computed fwhm value and add test

[jobo322]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.56%. Comparing base (3680d0e) to head (bfcbd34).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #145      +/-   ##
==========================================
+ Coverage   95.51%   95.56%   +0.04%     
==========================================
  Files          17       17              
  Lines         379      383       +4     
  Branches      128      132       +4     
==========================================
+ Hits          362      366       +4     
  Misses         17       17              

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