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