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Dropdowns update - keyboard, touch and submenus

Closed Administrator requested to merge github/fork/blakeembrey/dropdowns-update into 2.1.2-wip

Created by: blakeembrey

Fixes:

  • Keyboard navigation using submenus (acts similar to right-click in Mac, going up first starts to top of list, bottom the bottom - moves from there, etc. Only difference is that the submenus display on item focus)
  • Takes into account the .dropup, .dropdown and .pull-left modifier classes. E.g. If it's pull-left the left and right arrows switch around, if it's a dropup submenu - we start by focusing the last item vs the first which is at the top.
  • Touch navigation now works prevents the default click events from happening with the delay - looks ugly
  • [esc] key will bring you back in focus with the initial button no matter where in the dropdown you are (and tapping it again reopens the dropdown, like previous behaviour)