Suppress editing of locked files

[isc-etamarch]

Fixes #301

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 26.38%. Comparing base (17e75d2) to head (639f4da).

Files with missing lines	Patch %	Lines
cls/SourceControl/Git/Extension.cls	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #583      +/-   ##
==========================================
- Coverage   26.41%   26.38%   -0.04%     
==========================================
  Files          20       20              
  Lines        2782     2786       +4     
==========================================
  Hits          735      735              
- Misses       2047     2051       +4     

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