fix(sheet): fix unreasonable merged selections

[ybzky]

• I am sure that the code is update-to-date with the dev branch.

close #1357

[github-actions]

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[codecov]

Codecov Report

Attention: Patch coverage is 96.42857% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 32.62%. Comparing base (885ba4b) to head (fae073d).
Report is 4 commits behind head on dev.

Files	Patch %	Lines
...-ui/src/commands/commands/utils/selection-utils.ts	95.45%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1477      +/-   ##
==========================================
+ Coverage   32.59%   32.62%   +0.03%     
==========================================
  Files         905      905              
  Lines       50121    50146      +25     
  Branches    10431    10439       +8     
==========================================
+ Hits        16335    16359      +24     
- Misses      33786    33787       +1     

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