Fix analyzer RCS1211 (#1377)

Author: josefpihrt

ChangeLog.md

@@ -25,6 +25,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fix analyzer [RCS1055](https://josefpihrt.github.io/docs/roslynator/analyzers/RCS1055) ([PR](https://github.com/dotnet/roslynator/pull/1361))
 - Fix analyzer [RCS1261](https://josefpihrt.github.io/docs/roslynator/analyzers/RCS1261) ([PR](https://github.com/dotnet/roslynator/pull/1374))
 - Fix analyzer [RCS0056](https://josefpihrt.github.io/docs/roslynator/analyzers/RCS0056) ([PR](https://github.com/dotnet/roslynator/pull/1373))
+- Fix analyzer [RCS1211](https://josefpihrt.github.io/docs/roslynator/analyzers/RCS1211) ([PR](https://github.com/dotnet/roslynator/pull/1377))
 
 ## [4.9.0] - 2024-01-10
 

src/Analyzers/CSharp/Analysis/RemoveUnnecessaryElseAnalyzer.cs

@@ -61,6 +61,9 @@ private static bool IsFixable(ElseClauseSyntax elseClause, SemanticModel semanti
         if (ifStatementStatement is not BlockSyntax ifBlock)
             return CSharpFacts.IsJumpStatement(ifStatementStatement.Kind());
 
+        if (elseClause.SpanContainsDirectives())
+            return false;
+
         if (elseClause.Statement is BlockSyntax elseBlock)
         {
             if (LocalDeclaredVariablesOverlap(elseBlock, ifBlock, semanticModel))

src/Tests/Analyzers.Tests/RCS1211RemoveUnnecessaryElseTests.cs

@@ -46,6 +46,30 @@ int M(bool flag)
 ");
     }
 
+    [Fact, Trait(Traits.Analyzer, DiagnosticIdentifiers.RemoveUnnecessaryElse)]
+    public async Task TestNoDiagnostic_PreprocessorDirectives()
+    {
+        await VerifyNoDiagnosticAsync(@"
+#define FOO
+class C
+{
+    int M(bool flag)
+    {
+        if(flag)
+        {
+            return 1;
+        }
+        else
+        {
+#if FOO
+            return 0;
+#endif
+        }
+    }
+}
+");
+    }
+
     [Fact, Trait(Traits.Analyzer, DiagnosticIdentifiers.RemoveUnnecessaryElse)]
     public async Task TestNoDiagnostic_OverlappingLocalVariables()
     {