Fix hint-name collisions in SourceGenerator when two .refitter files share a filename

[Copilot]

Description:

Two .refitter files with the same filename in different directories (e.g. src/ApiA/petstore.refitter and src/ApiB/petstore.refitter) both produced petstore.g.cs as the Roslyn hint name, causing the second context.AddSource() call to throw ArgumentException: hintName 'petstore.g.cs' was already added and crash the analyzer for the entire build/IDE session. The filename variable computed from settings.OutputFilename was also dead code — never used in the hint name.

src/Refitter.SourceGenerator/RefitterSourceGenerator.cs

• When settings.OutputFilename is set, use it directly as the hint name (previously ignored)
• Otherwise, disambiguate by prefixing the sanitized directory path: src_ApiA_petstore.g.cs vs src_ApiB_petstore.g.cs
• Remove the dead filename variable

src/Refitter.Tests/SourceGeneratorFileIOTests.cs

• Test_HintName_IsUnique_For_SameFilename_InDifferentDirectories — regression test for the collision scenario
• Test_HintName_UsesOutputFilename_WhenSpecified — verifies OutputFilename is honored as the hint name

Example hint name disambiguation

src/ApiA/petstore.refitter  →  src_ApiA_petstore.g.cs
src/ApiB/petstore.refitter  →  src_ApiB_petstore.g.cs   ← no collision

With OutputFilename set in the .refitter file:

{
  "outputFilename": "PetstoreClient.g.cs"
}

→ hint name is PetstoreClient.g.cs (previously this value was computed but discarded)

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• collector.exceptionless.io
  • Triggering command: /home/REDACTED/work/refitter/refitter/src/Refitter.Tests/bin/Release/net10.0/Refitter.Tests /home/REDACTED/work/refitter/refitter/src/Refitter.Tests/bin/Release/net10.0/Refitter.Tests (dns block)
• config.exceptionless.io
  • Triggering command: /home/REDACTED/work/refitter/refitter/src/Refitter.Tests/bin/Release/net10.0/Refitter.Tests /home/REDACTED/work/refitter/refitter/src/Refitter.Tests/bin/Release/net10.0/Refitter.Tests (dns block)
• developers.intellihr.io
  • Triggering command: /home/REDACTED/work/refitter/refitter/src/Refitter.Tests/bin/Release/net10.0/Refitter.Tests /home/REDACTED/work/refitter/refitter/src/Refitter.Tests/bin/Release/net10.0/Refitter.Tests (dns block)
• heartbeat.exceptionless.io
  • Triggering command: /home/REDACTED/work/refitter/refitter/src/Refitter.Tests/bin/Release/net10.0/Refitter.Tests /home/REDACTED/work/refitter/refitter/src/Refitter.Tests/bin/Release/net10.0/Refitter.Tests (dns block)
• http://dc.services.visualstudio.com:443/christianhelle/refitter/main/test/OpenAPI/v3.0/petstore.json
  • Triggering command: /usr/bin/dotnet dotnet build /home/REDACTED/work/refitter/refitter/src/Refitter.Tests/bin/Release/net10.0/f72145c88b6e4f4abfee9a141a882bf3/Project.csproj .Tests/bin/Releaowner (http block)
  • Triggering command: /usr/bin/dotnet dotnet build /home/REDACTED/work/refitter/refitter/src/Refitter.Tests/bin/Release/net10.0/c0d2055ae257419d9a85e36805452f8a/Project.csproj git conf�� 8e7e3244358bc65fd8b4a55fe27/Project.csproj committer.email /snap/bin/sh ect.csproj (http block)
• http://dc.services.visualstudio.com:443/christianhelle/refitter/main/test/OpenAPI/v3.0/petstore.yaml
  • Triggering command: /usr/bin/dotnet dotnet build /home/REDACTED/work/refitter/refitter/src/Refitter.Tests/bin/Release/net10.0/f72145c88b6e4f4abfee9a141a882bf3/Project.csproj .Tests/bin/Releaowner (http block)
  • Triggering command: /usr/bin/dotnet dotnet build /home/REDACTED/work/refitter/refitter/src/Refitter.Tests/bin/Release/net10.0/c0d2055ae257419d9a85e36805452f8a/Project.csproj git conf�� 8e7e3244358bc65fd8b4a55fe27/Project.csproj committer.email /snap/bin/sh ect.csproj (http block)
• petstore.swagger.io
  • Triggering command: /home/REDACTED/work/refitter/refitter/src/Refitter.Tests/bin/Release/net10.0/Refitter.Tests /home/REDACTED/work/refitter/refitter/src/Refitter.Tests/bin/Release/net10.0/Refitter.Tests (dns block)
• petstore3.swagger.io
  • Triggering command: /home/REDACTED/work/refitter/refitter/src/Refitter.Tests/bin/Release/net10.0/Refitter.Tests /home/REDACTED/work/refitter/refitter/src/Refitter.Tests/bin/Release/net10.0/Refitter.Tests (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.18%. Comparing base (04787d9) to head (36e0a8a).
⚠️ Report is 27 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1058   +/-   ##
=======================================
  Coverage   93.18%   93.18%           
=======================================
  Files          27       27           
  Lines        1804     1804           
=======================================
  Hits         1681     1681           
  Misses         49       49           
  Partials       74       74           

Flag	Coverage Δ
unittests	93.18% <ø> (ø)

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