Fix analyzer RCS0053 - switch expression

ChangeLog.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+
+- Fix analyzer [RCS0053](https://josefpihrt.github.io/docs/roslynator/analyzers/RCS0053) ([PR](https://github.com/dotnet/roslynator/pull/1518))
+
 ## [4.12.5] - 2024-09-13
 
 ### Fixed

src/Formatting.Analyzers/CSharp/FixFormattingOfListAnalyzer.cs

@@ -428,6 +428,9 @@ static bool AnalyzeToken(SyntaxToken token, bool isOpen)
                     return true;
                 }
 
+                if (token.IsParentKind(SyntaxKind.SwitchExpression))
+                    return true;
+
                 if (token.IsParentKind(SyntaxKind.ObjectInitializerExpression)
                     && token.Parent.Parent.IsKind(
                         SyntaxKind.ObjectCreationExpression,

src/Tests/Formatting.Analyzers.Tests/RCS0053FixFormattingOfListTests.cs

@@ -1359,6 +1359,25 @@ public string M2(string value, string[] values)
     }
 }
 
+""");
+    }
+
+    [Fact, Trait(Traits.Analyzer, DiagnosticIdentifiers.FixFormattingOfList)]
+    public async Task TestNoDiagnostic_Multiline_SwitchExpression()
+    {
+        await VerifyNoDiagnosticAsync("""
+using System;
+
+class C
+{
+    string M(string value) =>
+        M(value switch
+        {
+            "a" => "a",
+            "b" => "b",
+            _ => throw new Exception()
+        });
+}
 """);
     }
 }