little editor refactor

addons/pvzadventure/PvZAdventure.cs

@@ -4,7 +4,7 @@ using Godot;
 [Tool]
 public partial class PvZAdventure : EditorPlugin
 {
-	private PackedScene panel = ResourceLoader.Load<PackedScene>("res://addons/pvzadventure/scenes/adventure_editor.tscn");
+	private PackedScene panel = ResourceLoader.Load<PackedScene>("uid://dkq82o31vr3i2");
 
 	private Control panelInstance;
 	public override void _EnterTree()

addons/pvzadventure/scenes/initial-editor/initial_editor.tscn

@@ -1,6 +1,6 @@
 [gd_scene load_steps=3 format=3 uid="uid://sqessjn0m4o3"]
 
-[ext_resource type="PackedScene" uid="uid://djb8ynxhnmo0t" path="res://addons/pvzadventure/scenes/universal_grid_item.tscn" id="1_d8e2t"]
+[ext_resource type="PackedScene" uid="uid://djb8ynxhnmo0t" path="res://addons/pvzadventure/scenes/initial-editor/universal_grid_item.tscn" id="1_d8e2t"]
 [ext_resource type="Script" uid="uid://cumeahjpjgagq" path="res://addons/pvzadventure/scripts/InitialEditor.cs" id="1_tu7vy"]
 
 [node name="InitialEditor" type="ScrollContainer"]

addons/pvzadventure/scripts/adventure-editor/AdventureResourceInspector.cs

@@ -145,9 +145,18 @@ public partial class AdventureResourceInspector : Node
 	}
 	private TreeItem CreateItem(string Name, TreeItem root = null)
 	{
-		var item = tree.CreateItem(root);
-		item.SetText(0, Name);
-		return item;
+		if (root == null)
+		{
+			var item = tree.CreateItem();
+			item.SetText(0, Name);
+			return item;
+		}
+		else
+		{
+			var item = tree.CreateItem(root);
+			item.SetText(0, Name);
+			return item;
+		}
 	}
 	private TreeItem CreateItem(string Name, TreeItem.TreeCellMode cellMode, bool editable, TreeItem root = null)
 	{