feat: Replace selected text with the new insert

[marc2332]

Closes #356

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.13%. Comparing base (cb10600) to head (c36464d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #678      +/-   ##
==========================================
+ Coverage   73.90%   74.13%   +0.22%     
==========================================
  Files         194      194              
  Lines       19951    20102     +151     
==========================================
+ Hits        14745    14902     +157     
+ Misses       5206     5200       -6     

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