FavouritesPage not updating continously

[Str4wF4b]

A problem with the Favourites Page (#25) where the Tabs state isn't changed when changing the Tab.
Temporary solved with a GestureDetector that changes the label background correctly, but only if clicking on the Container, i.e. only if clicking in the bordered fields "Movie" and "Series". If changing the tabs by swiping or clicking out of the bordered Container, the border colour doesn't change correctly: It should show a grey border, but shows a white border. That is because the tab index does not change inside the build method of the TabBar in #25's Page.