fix: merge selection sets for the same object on top level

[stuebingerb]

Resolves #404

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.30%. Comparing base (dceb4dd) to head (b7dc3ed).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #407   +/-   ##
=======================================
  Coverage   77.30%   77.30%           
=======================================
  Files         152      152           
  Lines        4877     4877           
  Branches      845      845           
=======================================
  Hits         3770     3770           
  Misses        788      788           
  Partials      319      319           

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