Function azul_core::display_list::get_nodes_that_need_scroll_clip

pub fn get_nodes_that_need_scroll_clip(
    node_hierarchy: &NodeHierarchy, 
    display_list_rects: &NodeDataContainer<DisplayRectangle>, 
    dom_rects: &NodeDataContainer<NodeData>, 
    layouted_rects: &NodeDataContainer<PositionedRectangle>, 
    parents: &[(usize, NodeId)], 
    pipeline_id: PipelineId
) -> ScrolledNodes

Returns all node IDs where the children overflow the parent, together with the (parent_rect, child_rect) - the child rect is the sum of the children.

TODO: The performance of this function can be theoretically improved:

• Unioning the rectangles is heavier than just looping through the children and summing up their width / height / padding + margin.
• Scroll nodes only need to be inserted if the parent doesn't have overflow: hidden activated
• Overflow for X and Y needs to be tracked seperately (for overflow-x / overflow-y separation), so there we'd need to track in which direction the inner_rect is overflowing.