fix(utils): only assign socket values if they differ to prevent library override reload wipes

utils.py

@@ -17,12 +17,7 @@ def silence_puresky():
 
 
 def _snapshot_fragile_sockets(obj, mod, iface):
-    """Snapshot Material/Object sockets before modifying any override.
+    """Snapshot Material/Object sockets before modifying any override."""
-
-    Writing to ANY mod[sid] on a GeoNode modifier can trigger Blender
-    to re-evaluate ALL library overrides on that modifier, wiping
-    Material and Object sockets back to their library defaults (NONE).
-    """
     FRAGILE_TYPES = {'NodeSocketMaterial', 'NodeSocketObject'}
     snapshot = {}
     for item in iface.items_tree:
@@ -33,6 +28,8 @@ def _snapshot_fragile_sockets(obj, mod, iface):
         sid = item.identifier
         if sid in mod and mod[sid] is not None:
             snapshot[sid] = mod[sid]
+            # Debug output to verify we grab the material
+            # print(f"  [SNAPSHOT] {obj.name} -> {item.name}: {mod[sid]}")
     return snapshot
 
 
@@ -41,9 +38,13 @@ def _restore_fragile_sockets(mod, snapshot):
     restored = 0
     for sid, value in snapshot.items():
         current = mod[sid] if sid in mod else None
-        if current is None and value is not None:
+        # Force restore if the current value no longer matches our snapshot
-            mod[sid] = value
+        if current != value:
-            restored += 1
+            try:
+                mod[sid] = value
+                restored += 1
+            except Exception as e:
+                print(f"  [RESTORE FAILED] {sid}: {e}")
     return restored
 
 
@@ -90,29 +91,43 @@ def fix_lib_overrides():
             ng_name = ng.name
             if ng_name == "Add Shader v1.0":
                 if "Filter by ID" in name_to_sid:
-                    mod[name_to_sid["Filter by ID"][0]] = True
+                    sid = name_to_sid["Filter by ID"][0]
-                    fixed += 1
+                    if mod.get(sid) != True:
+                        mod[sid] = True
+                        fixed += 1
                 if "ID" in name_to_sid and name_to_sid["ID"][1] == "NodeSocketString":
-                    mod[name_to_sid["ID"][0]] = "Index"
+                    sid = name_to_sid["ID"][0]
-                    fixed += 1
+                    if mod.get(sid) != "Index":
+                        mod[sid] = "Index"
+                        fixed += 1
             elif ng_name in ["Add Shaders by Index v1.0", "Make Material", "Make Labels"]:
                 if "ID" in name_to_sid and name_to_sid["ID"][1] == "NodeSocketString":
-                    mod[name_to_sid["ID"][0]] = "Index"
+                    sid = name_to_sid["ID"][0]
-                    fixed += 1
+                    if mod.get(sid) != "Index":
+                        mod[sid] = "Index"
+                        fixed += 1
                 if ng_name == "Make Labels" and "Shrinkwrap" in name_to_sid:
-                    mod[name_to_sid["Shrinkwrap"][0]] = True
+                    sid = name_to_sid["Shrinkwrap"][0]
-                    fixed += 1
+                    if mod.get(sid) != True:
+                        mod[sid] = True
+                        fixed += 1
             elif ng_name == "Make attached":
                 if "Reset Children" in name_to_sid:
-                    mod[name_to_sid["Reset Children"][0]] = True
+                    sid = name_to_sid["Reset Children"][0]
-                    fixed += 1
+                    if mod.get(sid) != True:
+                        mod[sid] = True
+                        fixed += 1
                 if "Separate Children" in name_to_sid:
-                    mod[name_to_sid["Separate Children"][0]] = True
+                    sid = name_to_sid["Separate Children"][0]
-                    fixed += 1
+                    if mod.get(sid) != True:
+                        mod[sid] = True
+                        fixed += 1
             elif ng_name == "Proxy v1.0":
                 if "Reset Children" in name_to_sid:
-                    mod[name_to_sid["Reset Children"][0]] = True
+                    sid = name_to_sid["Reset Children"][0]
-                    fixed += 1
+                    if mod.get(sid) != True:
+                        mod[sid] = True
+                        fixed += 1
 
             # Restore any fragile sockets that got wiped
             restored = _restore_fragile_sockets(mod, snapshot)