Sets the match function for @completion to be @func. The match function is used to determine if a row should or should not be in the completion list.
the #GtkEntryCompletionMatchFunc to use
user data for @func
destroy notify for @func_data.
2.4
See Implementation
Sets the match function for @completion to be @func. The match function is used to determine if a row should or should not be in the completion list.