[CodeCompletion] Fixed type hints for enumerations.

ICSharpCode.NRefactory.CSharp/Completion/CSharpCompletionEngine.cs

@@ -2278,8 +2278,9 @@ namespace ICSharpCode.NRefactory.CSharp.Completion
 			if (resolvedType.Kind != TypeKind.Enum) {
 				return;
 			}
-			completionList.AddEnumMembers(resolvedType, state);
-			DefaultCompletionString = resolvedType.Name;
+			var type = completionList.AddEnumMembers(resolvedType, state);
+			if (type != null)
+				DefaultCompletionString = type.DisplayText;
 		}
 		
 		IEnumerable<ICompletionData> CreateCompletionData(TextLocation location, ResolveResult resolveResult, AstNode resolvedNode, CSharpResolver state, Func<IType, IType> typePred = null)

ICSharpCode.NRefactory.CSharp/Completion/CompletionDataWrapper.cs

@@ -230,17 +230,18 @@ namespace ICSharpCode.NRefactory.CSharp.Completion
 			}
 		}
 		HashSet<IType> addedEnums = new HashSet<IType> ();
-		public void AddEnumMembers (IType resolvedType, CSharpResolver state)
+		public ICompletionData AddEnumMembers (IType resolvedType, CSharpResolver state)
 		{
 			if (addedEnums.Contains (resolvedType))
-				return;
+				return null;
 			addedEnums.Add (resolvedType);
-			AddType(resolvedType, true);
+			var result = AddType(resolvedType, true);
 			foreach (var field in resolvedType.GetFields ()) {
 				if (field.IsPublic && (field.IsConst || field.IsStatic)) {
 					Result.Add(Factory.CreateMemberCompletionData(resolvedType, field));
 				}
 			}
+			return result;
 		}
 	}
 }