[WIP] Enter selects, Tab selects and shifts focus
[WIP] Enter selects, Tab selects and shifts focus

Hi, the Tab behavior is really confusing users, since in all other Form Controls, "Tab" will switch focus, but for this one single control alone a user has to press Tab twice. Almost every user so far has asked "Why?" when I've asked them to press tab twice here.

How about - Enter selects and retains focus. Tab selects but also shifts focus? This PR does exactly that. Fixes #643

I'm still testing the changes so consider this Work In Progress and just for review.
VanCoding/react-select,taifen/react-select,yonaichin/react-select,foxbroadcasting/react-select,Reggino/react-select,range-me/react-select,DanielHeath/react-select,millerized/react-select,cmpis/react-select,realestate-com-au/react-select,serkanozer/react-select,Dem0n3D/react-select,mcls/react-select,hannahsquier/react-select,mobile5dev/react-select,stephennyu/select-react,JedWatson/react-select,Craga89/react-select,cmpis/react-select,glowka/react-select,Khan/react-select,Paveltarno/react-select,bruderstein/react-select,mmpro/react-select,f-camacho/react-select,alanrubin/react-select,khankuan/react-select,bruderstein/react-select,matroid/react-select,OpenGov/react-select,submittable/react-select,dmatteo/react-select,paulmillr/react-select,jacycode/react-select-plus-2,JedWatson/react-select