fn build_group_node(
group: &Group,
parent_abs: Transform,
) -> Transformed<Node<VItem>, DAffine3>Expand description
Build a group node from a usvg group and the absolute transform of
its parent group.
The node’s transform is the group’s transform relative to its
parent (parent_abs^-1 * group_abs), so path data is never rewritten
and re-posing any level of the tree is a local operation.