Fix inability to deselect nodes, and nodes not being selected when pasted (#2691)

* Deselect on shift/alt click and paste selects multiple mode

* Grid values persistance

* reset

---------

Co-authored-by: Keavon Chambers <[email protected]>

Author: mTvare6

editor/src/messages/portfolio/document/node_graph/node_graph_message_handler.rs

@@ -566,10 +566,12 @@ impl<'a> MessageHandler<NodeGraphMessage, NodeGraphHandlerData<'a>> for NodeGrap
 				responses.add(DocumentMessage::AddTransaction);
 
 				let new_ids: HashMap<_, _> = data.iter().map(|(id, _)| (*id, NodeId::new())).collect();
+				let nodes: Vec<_> = new_ids.iter().map(|(_, id)| *id).collect();
 				responses.add(NodeGraphMessage::AddNodes {
 					nodes: data,
 					new_ids: new_ids.clone(),
 				});
+				responses.add(NodeGraphMessage::SelectedNodesSet { nodes })
 			}
 			NodeGraphMessage::PointerDown {
 				shift_click,
@@ -995,11 +997,13 @@ impl<'a> MessageHandler<NodeGraphMessage, NodeGraphHandlerData<'a>> for NodeGrap
 					responses.add(NodeGraphMessage::TogglePreview { node_id: preview_node });
 					self.preview_on_mouse_up = None;
 				}
-				if let Some(node_to_deselect) = self.deselect_on_pointer_up {
-					let mut new_selected_nodes = selected_nodes.selected_nodes_ref().clone();
-					new_selected_nodes.remove(node_to_deselect);
-					responses.add(NodeGraphMessage::SelectedNodesSet { nodes: new_selected_nodes });
-					self.deselect_on_pointer_up = None;
+				if let Some(node_to_deselect) = self.deselect_on_pointer_up.take() {
+					if !self.drag_start.as_ref().is_some_and(|t| t.1) {
+						let mut new_selected_nodes = selected_nodes.selected_nodes_ref().clone();
+						new_selected_nodes.remove(node_to_deselect);
+						responses.add(NodeGraphMessage::SelectedNodesSet { nodes: new_selected_nodes });
+						return;
+					}
 				}
 				let point = network_metadata
 					.persistent_metadata