Fixed another performance issue in the ClassBrowser.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/branches/3.0@4222 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/Main/Base/Project/Src/Gui/Pads/ClassBrowser/ClassBrowser.cs

@@ -275,6 +275,7 @@ namespace ICSharpCode.SharpDevelop.Gui.ClassBrowser
 		
 		void ProjectServiceSolutionChanged(object sender, EventArgs e)
 		{
+			classBrowserTreeView.BeginUpdate();
 			classBrowserTreeView.Nodes.Clear();
 			if (ProjectService.OpenSolution != null) {
 				foreach (IProject project in ProjectService.OpenSolution.Projects) {
@@ -283,7 +284,9 @@ namespace ICSharpCode.SharpDevelop.Gui.ClassBrowser
 					}
 					ProjectNodeBuilders.AddProjectNode(classBrowserTreeView, project);
 				}
+				classBrowserTreeView.Sort();
 			}
+			classBrowserTreeView.EndUpdate();
 		}
 		
 		void ProjectServiceSolutionClosed(object sender, EventArgs e)

src/Main/Base/Project/Src/Gui/Pads/ClassBrowser/NodeBuilder/DefaultProjectNodeBuilder.cs

@@ -22,7 +22,6 @@ namespace ICSharpCode.SharpDevelop.Gui.ClassBrowser
 		{
 			ProjectNode prjNode = new ProjectNode(project);
 			prjNode.AddTo(classBrowser);
-			classBrowser.Sort();
 			return prjNode;
 		}
 	}