Providers can use this function to add proposals to the completion. They
can do so asynchronously by means of the @finished argument. Providers must
ensure that they always call this function with @finished set to %TRUE
once each population (even if no proposals need to be added).
Population occurs when the gtk_source_completion_provider_populate()
function is called.
Providers can use this function to add proposals to the completion. They can do so asynchronously by means of the @finished argument. Providers must ensure that they always call this function with @finished set to %TRUE once each population (even if no proposals need to be added). Population occurs when the gtk_source_completion_provider_populate() function is called.