ext-wide: prevent flicker on expand
ext-wide: prevent flicker on expand

hglty07/fancytree,Mats0/fancytree,hglty07/fancytree,grandmanitou/fancytree,Koloto/fancytree,HobieCat/fancytree,grandmanitou/fancytree,Koloto/fancytree,Koloto/fancytree,spilmert/fancytree,jiangjunt/fancytree,spilmert/fancytree,jiangjunt/fancytree,dewhisna/fancytree,jiangjunt/fancytree,dewhisna/fancytree,HobieCat/fancytree,dewhisna/fancytree,Aliccer/fancytree,Aliccer/fancytree,grandmanitou/fancytree,hglty07/fancytree,Aliccer/fancytree,HobieCat/fancytree,Mats0/fancytree,spilmert/fancytree