fixes ui and mutiuser case

gen_vlayer.py

@@ -217,7 +217,11 @@ def get_set_viewlayer_from_gp(ob, l, scene=None):
 
     in_rds = scene.collection.all_objects.get(ob.name)
     if not in_rds:
-        # TODO : link with a ob.data copy if its a multiuser object !
+        # TODO : ? duplicate the object with name with a specific suffix '_renderdupe' to still parse it ?
+        ## make single user if its a multiuser object ? maybe let the user do it
+        if ob.data.users > 1:
+            print(f'/!!\ {ob.name} data has multiple users ! ({ob.data.users})')
+            # ob.data = ob.data.copy() # create duplicate (this will also affect the one in original scene !!!)
         scene.collection.objects.link(ob)
         ob.hide_viewport = ob.hide_render = False