do not generate a new screen name for existing screens, fix #3924
do not generate a new screen name for existing screens, fix #3924

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