GetStatus correctly marks generated files read-only

[isc-pbarton]

Fixes ##712

You are now warned as soon as you open a generated file in Studio that it is marked as read-only. Previously it would only stop you from editing once you tried making a change.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.98%. Comparing base (c476e66) to head (5a07c34).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #915      +/-   ##
==========================================
+ Coverage   50.88%   50.98%   +0.09%     
==========================================
  Files          23       23              
  Lines        3109     3109              
==========================================
+ Hits         1582     1585       +3     
+ Misses       1527     1524       -3     

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