Improve deduplication logics to consider file path and bufnr

[Davidyz]

This PR takes /buffer, /file and #buffer into account when running deduplication.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.28%. Comparing base (f194e89) to head (1fe2cf7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #176   +/-   ##
=======================================
  Coverage   99.28%   99.28%           
=======================================
  Files          22       22           
  Lines        1534     1534           
=======================================
  Hits         1523     1523           
  Misses         11       11           

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