Use upper graph in subgraph stack for saved offset/scale

src/lib/ComfyGraphCanvas.ts

@@ -47,10 +47,16 @@ export default class ComfyGraphCanvas extends LGraphCanvas {
     _selectedNodes: Set<NodeID> = new Set();
 
     serialize(): SerializedGraphCanvasState {
-        return {
+        let offset = this.ds.offset;
-            offset: this.ds.offset,
+        let scale = this.ds.scale;
-            scale: this.ds.scale
+
+        // Use top-level graph for saved offset if we're viewing a subgraph
+        if (this._graph_stack?.length > 0) {
+            offset = this._graph_stack[0].offset;
+            scale = this._graph_stack[0].scale;
         }
+
+        return { offset, scale }
     }
 
     deserialize(data: SerializedGraphCanvasState) {

src/lib/nodes/ComfyPickImageNode.ts

@@ -78,6 +78,9 @@ export default class ComfyPickImageNode extends ComfyGraphNode {
             this.setOutputData(2, this._image.width);
             this.setOutputData(3, this._image.height);
 
+            // XXX: image size doesn't load until the <img> element is ready on
+            // the page so this can come after several frames' worth of
+            // execution
             this.widthWidget.value = this._image.width
             this.heightWidget.value = this._image.height
         }