old_contents: from gi.repository.IBus import \
      Bus, \
      Engine, \
      Attribute, \
      AttrList, \
      Text, \
      LookupTable, \
      Property, \
      PropList, \
      Component, \
      EngineDesc
  
new_contents: from gi.repository.IBus import \
      AttrList, \
      Attribute, \
      Bus, \
      Component, \
      Config, \
      Connection, \
      Engine, \
      EngineDesc, \
      Factory, \
      HotkeyProfile, \
      Keymap, \
      LookupTable, \
      Object, \
      ObservedPath, \
      PanelService, \
      PropList, \
      Property, \
      Proxy, \
      Serializable, \
      Server, \
      Service, \
      Text
  
subject: Add all classes in ibus.py