AssignmentMadeToSameVariableIssue: don't warn on "a += a;"

ICSharpCode.NRefactory.CSharp/Refactoring/CodeIssues/AssignmentMadeToSameVariableIssue.cs

@@ -56,6 +56,8 @@ namespace ICSharpCode.NRefactory.CSharp.Refactoring
 			{
 				base.VisitAssignmentExpression (assignmentExpression);
 
+				if (assignmentExpression.Operator != AssignmentOperatorType.Assign)
+					return;
 				if (!(assignmentExpression.Left is IdentifierExpression) && 
 					!(assignmentExpression.Left is MemberReferenceExpression))
 					return;

ICSharpCode.NRefactory.Tests/CSharp/CodeIssues/AssignmentMadeToSameVariableIssueTests.cs

@@ -209,6 +209,20 @@ class TestClass
 	{
 		nested.nested.a = nested.nested.a;
 	}
+}";
+			Test<AssignmentMadeToSameVariableIssue> (input, 0);
+		}
+		
+		[Test]
+		public void TestNoIssueWithCompoundOperator ()
+		{
+			var input = @"
+class TestClass
+{
+	void TestMethod (int a)
+	{
+		a += a;
+	}
 }";
 			Test<AssignmentMadeToSameVariableIssue> (input, 0);
 		}