Okay, so it's apparently being used by developers indeed. Never heard in art or anim. Haha.
It is probably a "Frenchized" English word.
Personally instead of:
" La quantité en pixels pour indenter les nœuds dans la hiérarchie d'affichage d'arbre."
I would have put:
" La quantité en pixels pour régler le retrait entre les nœuds dans la hiérarchie d’affichage en arbre. "
I find it simpler and clearer, but it's probably because I've never heard that word before. So check if other people make this feedback, but if I'm the only one it's possible that it's just not used by the graphic designers in my knowledge. ^^