[Completion] Fixed type 'overloads'.

ICSharpCode.NRefactory.CSharp/Completion/CompletionDataWrapper.cs

@@ -80,12 +80,11 @@ namespace ICSharpCode.NRefactory.CSharp.Completion
 			result.Add (Factory.CreateLiteralCompletionData (alias));
 		}
 
-
+		Dictionary<string, ICompletionData> usedTypes = new Dictionary<string, ICompletionData> ();
-		HashSet<string> usedTypes = new HashSet<string> ();
 
 		public ICompletionData AddType(IType type, string shortType)
 		{
-			if (type == null || string.IsNullOrEmpty(shortType) || usedTypes.Contains(shortType))
+			if (type == null || string.IsNullOrEmpty(shortType))
 				return null;
 			if (type.Name == "Void" && type.Namespace == "System")
 				return null;
@@ -93,9 +92,13 @@ namespace ICSharpCode.NRefactory.CSharp.Completion
 			var def = type.GetDefinition();
 			if (def != null && def.ParentAssembly != completion.ctx.CurrentAssembly && !def.IsBrowsable())
 				return null;
-
+			ICompletionData usedType;
-			usedTypes.Add(shortType);
+			if (usedTypes.TryGetValue (shortType, out usedType)) {
+				usedType.AddOverload (Factory.CreateTypeCompletionData(type, shortType));
+				return usedType;
+			} 
 			var iCompletionData = Factory.CreateTypeCompletionData(type, shortType);
+			usedTypes[shortType] = iCompletionData;
 			result.Add(iCompletionData);
 			return iCompletionData;
 		}