Fix analyzer RCS1201 (#1470)

ChangeLog.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 
 - 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))
 
 ## [4.12.3] - 2024-05-10
 

src/Common/CSharp/Analysis/UseMethodChaining/UseMethodChainingAnalysis.cs

@@ -71,6 +71,9 @@ public bool Analyze(
         if (statement.SpanOrTrailingTriviaContainsDirectives())
             return false;
 
+        if (statement.GetTrailingTrivia().Any(f => f.IsKind(SyntaxKind.SingleLineCommentTrivia, SyntaxKind.MultiLineCommentTrivia)))
+            return false;
+
         StatementListInfo statementsInfo = SyntaxInfo.StatementListInfo(statement);
 
         if (!statementsInfo.Success)
@@ -99,7 +102,12 @@ public bool Analyze(
         int j = i;
         while (j < statements.Count - 1)
         {
-            if (!IsFixableStatement(statements[j + 1], name, returnType, semanticModel, cancellationToken))
+            StatementSyntax statement2 = statements[j + 1];
+
+            if (statement2.GetLeadingTrivia().Any(f => f.IsKind(SyntaxKind.SingleLineCommentTrivia, SyntaxKind.MultiLineCommentTrivia)))
+                break;
+
+            if (!IsFixableStatement(statement2, name, returnType, semanticModel, cancellationToken))
                 break;
 
             j++;

src/Tests/Analyzers.Tests/RCS1201UseMethodChainingTests.cs

@@ -198,4 +198,50 @@ public C2 M2()
 }
 ");
     }
+
+    [Fact, Trait(Traits.Analyzer, DiagnosticIdentifiers.UseMethodChaining)]
+    public async Task TestNoDiagnostic_CommentsBetween()
+    {
+        await VerifyNoDiagnosticAsync("""
+
+using System.Text;
+
+public class C
+{
+    public void M()
+    {
+        var sb = new StringBuilder();
+
+        // first
+        sb.Append("first");
+
+        // second
+        sb.Append("second");
+    }
+}
+
+""");
+    }
+
+    [Fact, Trait(Traits.Analyzer, DiagnosticIdentifiers.UseMethodChaining)]
+    public async Task TestNoDiagnostic_CommentsBetween2()
+    {
+        await VerifyNoDiagnosticAsync("""
+
+using System.Text;
+
+public class C
+{
+    public void M()
+    {
+        var sb = new StringBuilder();
+
+        sb.Append("first"); // first
+
+        sb.Append("second");
+    }
+}
+
+""");
+    }
 }