Fix for multi file cli processing

[raivisdejus]

Fix for #1608

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.72%. Comparing base (98b7993) to head (7d2f3d0).

Files with missing lines	Patch %	Lines
buzz/widgets/main_window.py	84.61%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1609      +/-   ##
==========================================
+ Coverage   83.65%   83.72%   +0.06%     
==========================================
  Files         111      111              
  Lines       12668    12673       +5     
==========================================
+ Hits        10598    10610      +12     
+ Misses       2070     2063       -7     

Flag	Coverage Δ
Linux	82.88% <87.50%> (+0.01%)	⬆️
macOS	83.24% <87.50%> (+0.09%)	⬆️

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