feat: mimic blender undo handling

multi_user/operators.py

@@ -686,10 +686,14 @@ def sanitize_deps_graph(dummy):
     A future solution should be to avoid storing dataclock reference...
 
     """
-    if session and session.state['STATE'] == STATE_ACTIVE:
-        for node_key in session.list():
-            session.get(node_key).resolve()
 
+    if session and session.state['STATE'] == STATE_ACTIVE:
+        session.lock()
+        for node_key in session.list():
+            node = session.get(node_key)
+            if node and not node.resolve(construct=False):
+                session.remove(node_key)
+        session.unlock()
 
 @persistent
 def load_pre_handler(dummy):