While I generally appreciate the latest addition of tooltips (Apple calls it “help tag”, while Mac OS calls these “ballon help” 
but whatever 
) on traffic signs and features, there is an annoying usability issue when dealing with stacked items. The tooltips can get in the way of the selector bar. Since the tooltip is always displayed on top of the selector bar it also blocks any clicks on the selector bar. You have to make the tooltip go away by hovering over something else before you can click anything on the selector bar.
@nikola Perhaps you may want to display the tooltip below stacked items or not at all once the selector bar is visible? Consider edge cases on canvas edges!