Copy and paste -> Disabled paste of instances when selection is in Volume mode

src/slic3r/GUI/Selection.cpp

@@ -1078,7 +1078,8 @@ void Selection::paste_from_clipboard()
     }
     case Instance:
     {
-        paste_objects_from_clipboard();
+        if (m_mode == Instance)
+            paste_objects_from_clipboard();
 
         break;
     }