The indicator for a selected tab within a TabBar is not customizable beyond color. More control over the height and width would be great. Example cases would include making a thicker indicator and an indicator that's equal to the width of the actual tab text.

Related Stack Overflow posting:
https://stackoverflow.com/questions/44272440/how-can-i-customize-the-tabbar-indicator-width-and-height/44273493#44273493