Fix analyzer RCS1146 (#1747)

Author: josefpihrt

ChangeLog.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 
 - Fix enum contained flags check for partial matches in [RCS1258](https://josefpihrt.github.io/docs/roslynator/analyzers/RCS1258) ([PR](https://github.com/dotnet/roslynator/pull/1740) by @ovska)
+- Fix analyzer [RCS1146](https://josefpihrt.github.io/docs/roslynator/analyzers/RCS1146) ([PR](https://github.com/dotnet/roslynator/pull/1747))
 - Fix analyzer [RCS1194](https://josefpihrt.github.io/docs/roslynator/analyzers/RCS1194) ([PR](https://github.com/dotnet/roslynator/pull/1733))
 
 ## [4.15.0] - 2025-12-14

src/Analyzers/CSharp/Analysis/UseConditionalAccessAnalyzer.cs

@@ -331,6 +331,10 @@ private static bool ValidateRightExpression(
                         if (pattern is ConstantPatternSyntax constantPattern2)
                             return constantPattern2.Expression.WalkDownParentheses().IsKind(SyntaxKind.NullLiteralExpression);
                     }
+                    else if (pattern.IsKind(SyntaxKind.AndPattern))
+                    {
+                        return false;
+                    }
 
                     return true;
                 }

src/Tests/Analyzers.Tests/RCS1146UseConditionalAccessTests.cs

@@ -1021,4 +1021,21 @@ void M()
 }
 ", options: Options.AddConfigOption(ConfigOptionKeys.NullConditionalOperator_AvoidNegativeBooleanComparison, true));
     }
+
+    [Fact, Trait(Traits.Analyzer, DiagnosticIdentifiers.UseConditionalAccess)]
+    public async Task TestNoDiagnostic_AndPattern()
+    {
+        await VerifyNoDiagnosticAsync("""
+class Foo
+{
+  void M()
+  {
+      string data = null;
+      if (data != null && data.Length is not 2 and not 3)
+      {
+      }
+  }
+}
+""");
+    }
 }