The scroll frame re-shows the button's own native art whenever it
recalculates, and one skinning pass can't hold against it: ElvUI's
HandleNextPrevButton guards on isSkinned, so a second call does nothing.
The talent frame already carried the answer -- re-hide the art by file
from OnUpdate and pin the three state textures -- so it moves into the
shared layer as Skin:ScrollArrow and the Challenges list scrolls take it
too. Routing the talent frame through it also picks up the
disabled-hover fix every other button already has.
Narcasung
63e179e96e