consider book filename when detecting identical target

[elfkuzco]

Changes

• Consider location filename when detecting if source and target are the same.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.12%. Comparing base (30b5372) to head (41f8135).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #465   +/-   ##
=======================================
  Coverage   81.12%   81.12%           
=======================================
  Files          64       64           
  Lines        3879     3879           
  Branches      472      472           
=======================================
  Hits         3147     3147           
  Misses        581      581           
  Partials      151      151           

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