Get a customized info widget to show extra information of a proposal.
This allows for customized widgets on a proposal basis, although in general
providers will have the same custom widget for all their proposals and
proposal can be ignored. The implementation of this function is optional.
If implemented, gtk_source_completion_provider_update_info MUST also be
implemented. If not implemented, the default
gtk_source_completion_proposal_get_info will be used to display extra
information about a GtkSourceCompletionProposal.
Get a customized info widget to show extra information of a proposal. This allows for customized widgets on a proposal basis, although in general providers will have the same custom widget for all their proposals and proposal can be ignored. The implementation of this function is optional. If implemented, gtk_source_completion_provider_update_info MUST also be implemented. If not implemented, the default gtk_source_completion_proposal_get_info will be used to display extra information about a GtkSourceCompletionProposal.