Improve the detection of the changes made after a document has been signed

[calixteman]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 91.11111% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.86%. Comparing base (0c8f670) to head (ed81227).

Files with missing lines	Patch %	Lines
src/core/document.js	87.09%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #21620      +/-   ##
==========================================
+ Coverage   89.85%   89.86%   +0.01%     
==========================================
  Files         263      263              
  Lines       66769    66808      +39     
==========================================
+ Hits        59992    60034      +42     
+ Misses       6777     6774       -3     

Flag	Coverage Δ
browsertest	66.52% <15.55%> (-0.04%)	⬇️
fonttest	9.05% <ø> (ø)
integrationtest	69.27% <73.33%> (+0.02%)	⬆️
unittest	57.51% <91.11%> (+0.01%)	⬆️
unittestcli	56.49% <91.11%> (+0.05%)	⬆️

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[timvandermeij]

Looks good; thank you for fixing this, and adding more tests!