Also included bugfix from Winson: arcs wre not being cleared in invalidateStructure() so state wasn't properly cleared when children were added after the first layout operation. Change-Id: I7b46eadd955bd74b7bb3e4dad2f47ed3f092ff63
Also included bugfix from Winson: arcs wre not being cleared in invalidateStructure() so state wasn't properly cleared when children were added after the first layout operation. Change-Id: I7b46eadd955bd74b7bb3e4dad2f47ed3f092ff63