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>

frontend/wasm/src/editor_api.rs

@@ -622,7 +622,10 @@ impl EditorHandle {
 		self.dispatch(message);
 
 		let id = NodeId(id);
-		let message = NodeGraphMessage::DeleteNodes { node_ids: vec![id], reconnect: true };
+		let message = NodeGraphMessage::DeleteNodes {
+			node_ids: vec![id],
+			delete_children: true,
+		};
 		self.dispatch(message);
 	}
 
@@ -779,7 +782,7 @@ impl EditorHandle {
 			.map(|(id, _)| *id)
 			.collect::<Vec<_>>()
 		{
-			let layer = LayerNodeIdentifier::new(node, &document.network_interface);
+			let layer = LayerNodeIdentifier::new(node, &document.network_interface, &[]);
 			if layer.has_children(document.metadata()) {
 				continue;
 			}