Emitted when the client application get the update_auxiliary_text.
Implement the member function IBusPanelServiceClass:IBusPanelService:update_auxiliary_text in extended class to receive
this signal.
<note><para>Argument user_data is ignored in this function.</para> </note>
| text |
A preedit text to be updated. |
| visible |
Whether the update is visible. |