Bug 25827 Disposing of MemberFilterActionGroup
Build 2.0.2 and 2.1 When investigating an editor memory leak PR we found out that this group has a dispose method which is never called. When we then called from the editor it throw an exeption (viewer was disposed). Don't know if the group really needs dispose() if so it should get called.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/browsing/MembersView.java
case IJavaElement.COMPILATION_UNIT:
				return getTypeForCU((ICompilationUnit)je);
			case IJavaElement.CLASS_FILE:
				try {
					return findInputForJavaElement(((IClassFile)je).getType());
				} catch (JavaModelException ex) {
					return null;
				}
			case IJavaElement.IMPORT_DECLARATION:
				return findInputForJavaElement(je.getParent());
			case IJavaElement.PACKAGE_DECLARATION:
			case IJavaElement.IMPORT_CONTAINER:
				IJavaElement parent= je.getParent();
				if (parent instanceof ICompilationUnit) {
					IType[] types;
					try {
						types= ((ICompilationUnit)parent).getAllTypes();
					} catch (JavaModelException ex) {
						return null;
					}
					if (types.length > 0)
						return types[0];
					else
						return null;
				}
				else if (parent instanceof IClassFile)
					return findInputForJavaElement(parent);
			default:
				if (je instanceof IMember)
					return findInputForJavaElement(((IMember)je).getDeclaringType());