Warning
gtk_object_get_data_by_id is deprecated and should not be used in newly-written code. Use g_object_get_qdata() instead.
Just like gtk_object_get_data() except that it takes
a GQuark instead of a string, so it is slightly faster.
Use gtk_object_data_try_key() and gtk_object_data_force_id()
to get an id from a string.
Warning gtk_object_get_data_by_id is deprecated and should not be used in newly-written code. Use g_object_get_qdata() instead. Just like gtk_object_get_data() except that it takes a GQuark instead of a string, so it is slightly faster. Use gtk_object_data_try_key() and gtk_object_data_force_id() to get an id from a string.