remove experimental warnings from the window provider
remove experimental warnings from the window provider

kivy/kivy,kivy/kivy,LogicalDash/kivy,aron-bordin/kivy,kivy/kivy,darkopevec/kivy,rafalo1333/kivy,LogicalDash/kivy,inclement/kivy,rnixx/kivy,KeyWeeUsr/kivy,LogicalDash/kivy,manthansharma/kivy,tony/kivy,jegger/kivy,rafalo1333/kivy,bionoid/kivy,kived/kivy,manthansharma/kivy,bionoid/kivy,matham/kivy,darkopevec/kivy,akshayaurora/kivy,autosportlabs/kivy,darkopevec/kivy,manthansharma/kivy,Cheaterman/kivy,tony/kivy,aron-bordin/kivy,autosportlabs/kivy,aron-bordin/kivy,jegger/kivy,aron-bordin/kivy,matham/kivy,jegger/kivy,inclement/kivy,janssen/kivy,akshayaurora/kivy,kived/kivy,Cheaterman/kivy,KeyWeeUsr/kivy,rnixx/kivy,janssen/kivy,jkankiewicz/kivy,bionoid/kivy,kived/kivy,inclement/kivy,Cheaterman/kivy,bionoid/kivy,jkankiewicz/kivy,jkankiewicz/kivy,Cheaterman/kivy,autosportlabs/kivy,matham/kivy,tony/kivy,akshayaurora/kivy,janssen/kivy,janssen/kivy,KeyWeeUsr/kivy,matham/kivy,rafalo1333/kivy,jegger/kivy,rnixx/kivy,LogicalDash/kivy,manthansharma/kivy,KeyWeeUsr/kivy,darkopevec/kivy,jkankiewicz/kivy