Bug 119827 Window working set has strange name in type hierarchy view
Build id: I20051206-1200 Don't know if this is JDT/UI or Platform/UI but when the window working set is selected a strange name is presented in the title bar of the view (see attached screen shot)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/PackageExplorerPart.java
public boolean isExpandable(Object parent) {
			if (isFlatLayout())
				return super.isExpandable(parent);
			if (parent instanceof IJavaProject) 
				return super.isExpandable(parent);
			
			ViewerFilter[] filters= getFilters();
			Object[] children= ((ITreeContentProvider)getContentProvider()).getChildren(parent);
			for (int i = 0; i < children.length; i++) {
				Object object= children[i];
				
				if (isEssential(object))
					return true;
				
				object= filter(object, parent, filters);
				if (object != null)
					return true;
			}
			return false;
		}
		
		
		private Object filter(Object object, Object parent, ViewerFilter[] filters) {
			for (int i = 0; i < filters.length; i++) {
				ViewerFilter filter = filters[i];
				if (!filter.select(this, parent, object))
					return null;
			}
			return object;
		}