Bottom Nav Bar does not show if there are four or more items

[mjohnsullivan]

Bottom Nav Bar does not show if there are four or more items

[mjohnsullivan]

Never tried more than three; I'll take a look into it.

[mjohnsullivan]

Turns out that when there's more than 3 items in the nav bar, it changes it's type from fixed to shifting, and shifting, and shifting renders items in white:

https://docs.flutter.io/flutter/material/BottomNavigationBar-class.html

I'll update the sample to talk about this and give an example of how it's handled.