Fix duplicate analyzers (#1477)

Author: josefpihrt

ChangeLog.md

@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fix analyzer [RCS1108](https://josefpihrt.github.io/docs/roslynator/analyzers/RCS1108) ([PR](https://github.com/dotnet/roslynator/pull/1469))
 - Fix analyzer [RCS1201](https://josefpihrt.github.io/docs/roslynator/analyzers/RCS1201) ([PR](https://github.com/dotnet/roslynator/pull/1470))
 - Fix analyzer [RCS0012](https://josefpihrt.github.io/docs/roslynator/analyzers/RCS0012) ([PR](https://github.com/dotnet/roslynator/pull/1472))
+- [CLI] Fix duplicate analyzers ([PR](https://github.com/dotnet/roslynator/pull/1477))
 
 ## [4.12.3] - 2024-05-10
 

src/Workspaces.Core/AnalyzerLoader.cs

@@ -64,7 +64,7 @@ public ImmutableArray<DiagnosticAnalyzer> GetAnalyzers(Project project)
 
     private (ImmutableArray<DiagnosticAnalyzer> analyzers, ImmutableArray<CodeFixProvider> fixers) GetAnalyzersAndFixers(
         Project project,
-        bool loadFixers = true)
+        bool loadFixers)
     {
         string language = project.Language;
 
@@ -104,6 +104,7 @@ public ImmutableArray<DiagnosticAnalyzer> GetAnalyzers(Project project)
                 .Distinct()
                 .OfType<AnalyzerFileReference>()
                 .Select(f => f.GetAssembly())
+                .Distinct(AssemblyFullNameComparer.Instance)
                 .Where(f => !_defaultAssemblies.ContainsKey(f.FullName)))
             {
                 if (!_cache.TryGetValue(assembly.FullName, out AnalyzerAssembly analyzerAssembly))

src/Workspaces.Core/AssemblyFullNameComparer.cs

@@ -0,0 +1,22 @@
+// Copyright (c) .NET Foundation and Contributors. Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using System.Collections.Generic;
+using System.Reflection;
+
+namespace Roslynator;
+
+internal sealed class AssemblyFullNameComparer : EqualityComparer<Assembly>
+{
+    public static AssemblyFullNameComparer Instance { get; } = new();
+
+    public override bool Equals(Assembly x, Assembly y)
+    {
+        return StringComparer.Ordinal.Equals(x.FullName, y.FullName);
+    }
+
+    public override int GetHashCode(Assembly obj)
+    {
+        return StringComparer.Ordinal.GetHashCode(obj.FullName);
+    }
+}