Add unittest for TextInput selection overwrite
Add unittest for TextInput selection overwrite

rnixx/kivy,bionoid/kivy,akshayaurora/kivy,KeyWeeUsr/kivy,KeyWeeUsr/kivy,bionoid/kivy,rnixx/kivy,Cheaterman/kivy,LogicalDash/kivy,Cheaterman/kivy,LogicalDash/kivy,akshayaurora/kivy,matham/kivy,bionoid/kivy,kivy/kivy,Cheaterman/kivy,KeyWeeUsr/kivy,akshayaurora/kivy,inclement/kivy,kivy/kivy,bionoid/kivy,inclement/kivy,inclement/kivy,matham/kivy,LogicalDash/kivy,LogicalDash/kivy,KeyWeeUsr/kivy,kivy/kivy,rnixx/kivy,matham/kivy,Cheaterman/kivy,matham/kivy