Gets the label of @proposal with markup. The label is shown in the list of
proposals and may contain markup. This will be used instead of
gtk_source_completion_proposal_get_label() if implemented. The returned string
must be freed with g_free().
Return: a new string containing the label of @proposal with markup.
Gets the label of @proposal with markup. The label is shown in the list of proposals and may contain markup. This will be used instead of gtk_source_completion_proposal_get_label() if implemented. The returned string must be freed with g_free().
Return: a new string containing the label of @proposal with markup.