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/typehierarchy/TypeHierarchyViewPart.java
}	
		addDragAdapters(fMethodsViewer, ops, transfers);
		
		DropTarget dropTarget = new DropTarget(fNoHierarchyShownLabel, ops | DND.DROP_DEFAULT);
		dropTarget.setTransfer(transfers);
		dropTarget.addDropListener(new TypeHierarchyTransferDropAdapter(this, fAllViewers[0]));
	}
	
	private void addDropAdapters(AbstractTreeViewer viewer, int ops, Transfer[] transfers){
		TransferDropTargetListener[] dropListeners= new TransferDropTargetListener[] {
			new TypeHierarchyTransferDropAdapter(this, viewer)
		};
		viewer.addDropSupport(ops, transfers, new DelegatingDropAdapter(dropListeners));
	}
	private void addDragAdapters(StructuredViewer viewer, int ops, Transfer[] transfers){
		Control control= viewer.getControl();
		TransferDragSourceListener[] dragListeners= new TransferDragSourceListener[] {
			new SelectionTransferDragAdapter(viewer)
		};
		DragSource source= new DragSource(control, ops);
		
		source.addDragListener(new DelegatingDragAdapter(dragListeners));		
	}	
	
	private void viewPartKeyShortcuts(KeyEvent event) {
		if (event.stateMask == SWT.CTRL) {
			if (event.character == '1') {
				setView(VIEW_ID_TYPE);
			} else if (event.character == '2') {
				setView(VIEW_ID_SUPER);