Add shifting of layers in stacks as blocks that collide and bump other layers/nodes (#1940)

* Shift nodes as blocks

* Implement rubber banding

* Improve upstream locking when shifting layers

* WIP: Reworked shifting

* WIP: Reworked node shifting

* Finish shifting

* Fix demo artwork

* Code review

* Right click to end shift

* Improve rubber banding

* Fix clippy issues

* Skip collision for intersecting nodes

* Rubber banding bug fix

* Fix ctrl+delete node in chain

* Grip drag

* Fix layer width

* Add icon to frontend for the solo drag grip

* Reconnect during ctrl+delete

* Code review

---------

Co-authored-by: Keavon Chambers <keavon@keavon.com>

editor/src/messages/tool/tool_messages/imaginate_tool.rs

@@ -1,9 +1,6 @@
 use super::tool_prelude::*;
-use crate::messages::portfolio::document::utility_types::document_metadata::LayerNodeIdentifier;
 use crate::messages::tool::common_functionality::resize::Resize;
 
-use graph_craft::document::{generate_uuid, NodeId};
-
 #[derive(Default)]
 pub struct ImaginateTool {
 	fsm_state: ImaginateToolFsmState,
@@ -101,7 +98,7 @@ impl Fsm for ImaginateToolFsmState {
 			(ImaginateToolFsmState::Ready, ImaginateToolMessage::DragStart) => {
 				shape_data.start(document, input);
 				responses.add(DocumentMessage::StartTransaction);
-				shape_data.layer = Some(LayerNodeIdentifier::new(NodeId(generate_uuid()), &document.network_interface));
+				//shape_data.layer = Some(LayerNodeIdentifier::new(NodeId(generate_uuid()), &document.network_interface));
 				responses.add(DocumentMessage::DeselectAllLayers);
 
 				// // Utility function to offset the position of each consecutive node

editor/src/messages/tool/tool_messages/select_tool.rs

@@ -367,7 +367,7 @@ impl SelectToolData {
 		for layer in document.network_interface.shallowest_unique_layers(&[]) {
 			responses.add(NodeGraphMessage::DeleteNodes {
 				node_ids: vec![layer.to_node()],
-				reconnect: true,
+				delete_children: true,
 			});
 		}
 
@@ -1203,6 +1203,7 @@ fn drag_deepest_manipulation(responses: &mut VecDeque<Message>, selected: Vec<La
 	tool_data.layers_dragging.append(&mut vec![document.find_deepest(&selected).unwrap_or(LayerNodeIdentifier::new(
 		document.network_interface.root_node(&[]).expect("Root node should exist when dragging layers").node_id,
 		&document.network_interface,
+		&[],
 	))]);
 	responses.add(NodeGraphMessage::SelectedNodesSet {
 		nodes: tool_data