Skip code-fix assemblies when configuring Roslyn analyzers

src/NuGetForUnity.Tests/Assets/Tests/Editor/NuGetTests.cs

@@ -52,6 +52,13 @@ public void SimpleRestoreTest()
         Assert.Pass();
     }
 
+    [TestCase("MessagePack.Analyzers.CodeFixes.dll")]
+    [TestCase("messagepack.analyzers.codefixes.DLL")]
+    public void CodeFixAssemblyIsNotEnabledAsRoslynAnalyzerTest(string assemblyPath)
+    {
+        Assert.IsFalse(AnalyzerHelper.ShouldEnableRoslynAnalyzer(assemblyPath));
+    }
+
     [Test]
     public void LoadConfigFileTest()
     {

src/NuGetForUnity/Editor/Helper/AnalyzerHelper.cs

@@ -16,6 +16,11 @@ internal static class AnalyzerHelper
         /// </summary>
         private const string AnalyzersFolderName = "analyzers";
 
+        /// <summary>
+        ///     File name suffix used by assemblies that provide IDE code fixes instead of compiler analyzers.
+        /// </summary>
+        private const string CodeFixAssemblySuffix = ".CodeFixes.dll";
+
         /// <summary>
         ///     Name of the root folder containing dotnet analyzers.
         /// </summary>
@@ -33,6 +38,11 @@ internal static class AnalyzerHelper
         /// <returns>True if the label should be added, false otherwise.</returns>
         public static bool ShouldEnableRoslynAnalyzer(string path)
         {
+            if (path.EndsWith(CodeFixAssemblySuffix, StringComparison.OrdinalIgnoreCase))
+            {
+                return false;
+            }
+
             // The nuget package can contain analyzers for multiple Roslyn versions.
             // In that case, for the same package, the most recent version must be chosen out of those available for the current Unity version.
             var assetPath = Path.GetFullPath(path);