Node network subgraph editing (#1750)

* Breadcrumb visualization, nested network consistency, create definitions for Merge internal nodes

* Add index to network inputs, remove imports usage from flatten network

* Replace NodeOutput with NodeInput::Node

* Fully remove imports field, remove unnecessary identity nodes, move Output node to encapsulating network

* Replace previous_outputs with root_node, fix adding artboard/layer to empty network

* Import/Export UI nodes

* Display input/output types dynamically from compiled network

* Add LayerNodeIdentifer::ROOT_PARENT

* Prevent .to_node() on ROOT_PARENT

* Separate NodeGraphMessage and GraphOperationMessage

* General bug fixes with nested networks

* Change layer color, various bug fixes and improvements

* Fix disconnect and set node input for proto nodes and UI export node

* Dashed line to export for previewed node

* Fix deleting proto nodes and nodes that feed into export

* Allow modifications to nodes outside of nested network

* Get network from Node Id parameter

* Change root_node to previous_root_node

* Get TaggedValue from proto node implementation type when disconnecting

* Improve preview functionality and state

* Artboard position and delete children fix

* Name inputs/outputs based on DocumentNodeDefinition or type, fix new artboard/layer insertion

* replace "Link" with "Wire", adjust previewing

* Various bug fixes and improvements

* Modify Sample and Poisson-Disk points, fix incorrect input index and deleting currently viewed node

* Open demo artwork

* Fix opening already upgraded documents and refactor FrontendGraphDataType usages

* Fix deleting within network and other bugs

* Get default node input from compiled network when copying, fix previews, tests, demo artwork

* Code cleanup

* Hide EditorApi and add a comment describing unresolved Import node input types

* Code review

* Replace placeholder ROOT_PARENT NodeId with std::u64::MAX

* Breadcrumb padding

---------

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

node-graph/compilation-client/src/main.rs

@@ -37,9 +37,7 @@ fn main() {
 
 fn add_network() -> NodeNetwork {
 	NodeNetwork {
-		imports: vec![],
-		exports: vec![NodeOutput::new(NodeId(0), 0)],
-		previous_outputs: None,
+		exports: vec![NodeInput::node(NodeId(0), 0)],
 		nodes: [DocumentNode {
 			name: "Blend Image".into(),
 			inputs: vec![NodeInput::Inline(InlineRust::new(
@@ -67,5 +65,6 @@ fn add_network() -> NodeNetwork {
 		.enumerate()
 		.map(|(id, node)| (NodeId(id as u64), node))
 		.collect(),
+		..Default::default()
 	}
 }