Update extra information shown in @info for @proposal.
<note> <para> This function <emphasis>must</emphasis> be implemented when gtk_source_completion_provider_get_info_widget() is implemented. </para> </note>
a #GtkSourceCompletionProposal.
a #GtkSourceCompletionInfo.
See Implementation
Update extra information shown in @info for @proposal.
<note> <para> This function <emphasis>must</emphasis> be implemented when gtk_source_completion_provider_get_info_widget() is implemented. </para> </note>