Fix #261: Class members added in code are shown twice and some more problems with overloaded methods.

src/Main/Base/Project/Dom/ClassBrowser/ClassBrowserTreeView.cs

@@ -183,7 +183,7 @@ namespace ICSharpCode.SharpDevelop.Dom.ClassBrowser
 												int entityParamsCount = parametrizedEntityMember.Parameters != null ? parametrizedEntityMember.Parameters.Count : 0;
 												if (treeNodeParamsCount == entityParamsCount) {
 													for (int i = 0; i < entityParamsCount; i++) {
-														if (parametrizedEntityMember.Parameters[i].Type.FullName != parametrizedTreeNodeMember.Parameters[i].Type.Resolve(entityAssembly.Compilation).FullName) {
+														if (!parametrizedEntityMember.Parameters[i].Type.Equals(parametrizedTreeNodeMember.Parameters[i].Type.Resolve(entityAssembly.Compilation))) {
 															return false;
 														}
 													}

src/Main/Base/Project/Dom/ClassBrowser/TypeDefinitionTreeNode.cs

@@ -17,6 +17,7 @@ namespace ICSharpCode.SharpDevelop.Dom.ClassBrowser
 	{
 		static readonly IComparer<SharpTreeNode> TypeMemberNodeComparer =  new TypeDefinitionMemberNodeComparer();
 		ITypeDefinitionModel definition;
+		IModelCollection<object> combinedModelChildren;
 		
 		public TypeDefinitionTreeNode(ITypeDefinitionModel definition)
 		{
@@ -27,6 +28,7 @@ namespace ICSharpCode.SharpDevelop.Dom.ClassBrowser
 				UpdateBaseTypesNode();
 				UpdateDerivedTypesNode();
 			};
+			this.combinedModelChildren = definition.NestedTypes.Concat<object>(definition.Members);
 		}
 		
 		protected override object GetModel()
@@ -55,7 +57,7 @@ namespace ICSharpCode.SharpDevelop.Dom.ClassBrowser
 		
 		protected override IModelCollection<object> ModelChildren {
 			get {
-				return definition.NestedTypes.Concat<object>(definition.Members);
+				return combinedModelChildren;
 			}
 		}
 		

src/Main/Base/Project/Dom/ClassBrowser/WorkspaceTreeNode.cs

@@ -35,10 +35,13 @@ namespace ICSharpCode.SharpDevelop.Dom.ClassBrowser
 			}
 		}
 		
+		IModelCollection<object> combinedModelChildren;
+
 		protected static readonly IComparer<SharpTreeNode> ChildNodeComparer = new WorkspaceChildComparer();
 		
 		public WorkspaceTreeNode()
 		{
+			combinedModelChildren = SD.ClassBrowser.MainAssemblyList.Assemblies.Concat(SD.ClassBrowser.UnpinnedAssemblies.Assemblies);
 			SD.ClassBrowser.CurrentWorkspace.AssemblyLists.CollectionChanged += AssemblyListsCollectionChanged;
 		}
 		
@@ -48,7 +51,7 @@ namespace ICSharpCode.SharpDevelop.Dom.ClassBrowser
 		}
 		
 		protected override IModelCollection<object> ModelChildren {
-			get { return SD.ClassBrowser.MainAssemblyList.Assemblies.Concat(SD.ClassBrowser.UnpinnedAssemblies.Assemblies); }
+			get { return combinedModelChildren; }
 		}
 		
 		protected override IComparer<SharpTreeNode> NodeComparer {

src/Main/Base/Project/Dom/ModelCollectionChangedEvent.cs

@@ -25,7 +25,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 		
 		public void AddHandler(ModelCollectionChangedEventHandler<T> handler)
 		{
-			if (handler != null)
+			if ((handler != null) && !_handlers.Contains(handler))
 				_handlers.Add(handler);
 		}
 		

src/Main/SharpDevelop/Dom/TypeDefinitionModel.cs

@@ -36,6 +36,11 @@ namespace ICSharpCode.SharpDevelop.Dom
 			this.fullTypeName = firstPart.FullTypeName;
 		}
 		
+		public IEntityModelContext Context
+		{
+			get { return context; }
+		}
+		
 		public IReadOnlyList<IUnresolvedTypeDefinition> Parts {
 			get { return parts; }
 		}
@@ -139,14 +144,14 @@ namespace ICSharpCode.SharpDevelop.Dom
 				var newMembers = newPart.Members;
 				int startPos = 0;
 				// Look at the initial members and update them if they're matching
-				while (startPos < list.Count && startPos < newMembers.Count && IsMatch(list[startPos], newMembers[startPos])) {
+				while (startPos < list.Count && startPos < newMembers.Count && IsMatch(parent.Context, list[startPos], newMembers[startPos])) {
 					list[startPos].Update(newMembers[startPos]);
 					startPos++;
 				}
 				// Look at the final members
 				int endPosOld = list.Count - 1;
 				int endPosNew = newMembers.Count - 1;
-				while (endPosOld >= startPos && endPosNew >= startPos && IsMatch(list[endPosOld], newMembers[endPosNew])) {
+				while (endPosOld >= startPos && endPosNew >= startPos && IsMatch(parent.Context, list[endPosOld], newMembers[endPosNew])) {
 					list[endPosOld--].Update(newMembers[endPosNew--]);
 				}
 				// [startPos, endPos] is the middle portion that contains all the changes
@@ -172,9 +177,32 @@ namespace ICSharpCode.SharpDevelop.Dom
 				}
 			}
 			
-			static bool IsMatch(MemberModel memberModel, IUnresolvedMember newMember)
+			static bool IsMatch(IEntityModelContext context, MemberModel memberModel, IUnresolvedMember newMember)
 			{
-				return memberModel.SymbolKind == newMember.SymbolKind && memberModel.Name == newMember.Name;
+				bool isSymbolOfTypeAndName = memberModel.SymbolKind == newMember.SymbolKind && memberModel.Name == newMember.Name;
+				if (isSymbolOfTypeAndName) {
+					var parametrizedNewMember = newMember as IUnresolvedParameterizedMember;
+					var parametrizedModelMember = memberModel.UnresolvedMember as IUnresolvedParameterizedMember;
+					if ((parametrizedNewMember != null) && (parametrizedModelMember != null)) {
+						// For methods and constructors additionally check the parameters and their types to handle overloading properly
+						int treeNodeParamsCount = parametrizedModelMember.Parameters != null ? parametrizedModelMember.Parameters.Count : 0;
+						int entityParamsCount = parametrizedNewMember.Parameters != null ? parametrizedNewMember.Parameters.Count : 0;
+						if (treeNodeParamsCount == entityParamsCount) {
+							for (int i = 0; i < entityParamsCount; i++) {
+								if (!parametrizedNewMember.Parameters[i].Type.Resolve(context.GetCompilation()).Equals(parametrizedModelMember.Parameters[i].Type.Resolve(context.GetCompilation()))) {
+									return false;
+								}
+							}
+							
+							// All parameters were equal
+							return true;
+						}
+					} else {
+						return true;
+					}
+				}
+				
+				return false;
 			}
 			
 			public event ModelCollectionChangedEventHandler<MemberModel> CollectionChanged {