Just updated Popper for Emacs with hinting in the echo area: When you toggle a popup, popups for the current context are listed in the echo area along with keyboard hints (M-1 through M-9 by default) to switch to them instantly. The listing is in the order in which the popups are displayed with popper-cycle. Here is a demo of this in action. There is a dispatch feature included that is currently undocumented.
