stop tab buttons from scrolling around
stop tab buttons from scrolling around

The always_overscroll (default true) option that was added to ScrollView in #6678 causes the buttons of TabbedPanel to always scroll
rnixx/kivy,akshayaurora/kivy,matham/kivy,matham/kivy,rnixx/kivy,akshayaurora/kivy,matham/kivy,kivy/kivy,matham/kivy,akshayaurora/kivy,rnixx/kivy,kivy/kivy,kivy/kivy