feat: more plugin work and intra-scope communication

addons/GodotDI/Editor/Plugin.cs

@@ -77,6 +77,7 @@ public partial class Plugin : EditorPlugin
         // mark debounce as completed
         _sceneTreeTimer = null;
 
+
         // check that the instance is still valid after debouncing (could have been disposed)
         if (!IsInstanceValid(sceneRoot)) return;
 
@@ -96,6 +97,7 @@ public partial class Plugin : EditorPlugin
                 return;
             default:
             {
+                if (!IsInstanceValid(serviceSource)) return;
                 // find all nodes that need injection
                 var nodesNeedingInjection = sceneNodes.Where(node =>
                 {
@@ -109,7 +111,7 @@ public partial class Plugin : EditorPlugin
                 }).ToList();
 
                 // add all nodes needed to the scope
-                var injectedNodes = serviceSource!.Get(ServiceSource.PropertyName.InjectedNodes).AsGodotArray();
+                var injectedNodes = serviceSource.Get(ServiceSource.PropertyName.InjectedNodes).AsGodotArray();
                 Array? newArray = null;
                 foreach (var node in nodesNeedingInjection
                              .Where(node => !injectedNodes.Contains(node)))
@@ -137,7 +139,8 @@ public partial class Plugin : EditorPlugin
                     var undoRedo = GetUndoRedo();
                     undoRedo.CreateAction("Update injected nodes");
                     undoRedo.AddDoProperty(serviceSource, ServiceSource.PropertyName.InjectedNodes, newArray);
-                    undoRedo.AddUndoProperty(serviceSource, ServiceSource.PropertyName.InjectedNodes, injectedNodes);
+                    undoRedo.AddUndoProperty(serviceSource, ServiceSource.PropertyName.InjectedNodes,
+                        new Array(injectedNodes));
                     undoRedo.CommitAction();
                 }