[Completion] Fixed enum completion in binary operator expressions.

ICSharpCode.NRefactory.CSharp/Completion/CSharpCompletionEngine.cs

@@ -1118,6 +1118,15 @@ namespace ICSharpCode.NRefactory.CSharp.Completion
 				rr = ResolveExpression(node, unit);
 			}
 
+			if (node is Expression) {
+				var astResolver = new CSharpAstResolver(GetState(), xp.Unit, CSharpParsedFile);
+				foreach (var type in CreateFieldAction.GetValidTypes(astResolver, (Expression)node)) {
+					if (type.Kind == TypeKind.Enum) {
+						AddEnumMembers(wrapper, type, rr.Item2);
+					}
+				}
+			}
+
 			if (node is Identifier && node.Parent is ForeachStatement) {
 				var foreachStmt = (ForeachStatement)node.Parent;
 				foreach (var possibleName in GenerateNameProposals (foreachStmt.VariableType)) {

ICSharpCode.NRefactory.Tests/CSharp/CodeCompletion/CodeCompletionAccessibleTests.cs

@@ -1177,7 +1177,28 @@ class TestClass
 			Assert.IsNotNull (provider.Find ("InnerEnumTest.TestEnum.B"), "enum 'InnerEnumTest.TestEnum.B' not found.");
 			Assert.IsNotNull (provider.Find ("InnerEnumTest.TestEnum.C"), "enum 'InnerEnumTest.TestEnum.C' not found.");
 		}
-		
+
+		[Test()]
+		public void TestEnumInBinaryOperatorExpression ()
+		{
+			CompletionDataList provider = CodeCompletionBugTests.CreateCtrlSpaceProvider (
+@"
+[Flags]
+public enum TestEnum { A, B, C}
+
+class TestClass
+{
+	public void Foo ()
+	{
+		$TestEnum test = TestEnum.A | $
+	}
+}");
+			Assert.IsNotNull (provider, "provider not found.");
+			Assert.IsNotNull (provider.Find ("TestEnum"), "enum 'TestEnum' not found.");
+			Assert.IsNotNull (provider.Find ("TestEnum.A"), "enum 'TestEnum.A' not found.");
+			Assert.IsNotNull (provider.Find ("TestEnum.B"), "enum 'TestEnum.B' not found.");
+			Assert.IsNotNull (provider.Find ("TestEnum.C"), "enum 'TestEnum.C' not found.");
+		}
 		
 		[Test()]
 		public void TestPrimimitiveTypeCompletionString ()