CompletionProvider.populateAsync

void populateAsync(gtksource.completion_context.CompletionContext context,  gio.cancellable.Cancellable cancellable =  null,  gio.types.AsyncReadyCallback callback =  null)

Asynchronously requests that the provider populates the completion results for context.

For providers that would like to populate a gio.list_model.ListModel while those results are displayed to the user, gtksource.completion_context.CompletionContext.setProposalsForProvider may be used to reduce latency until the user sees results.

Parameters

`context`	a #GtkSourceCompletionContext
`cancellable`	a #GCancellable or null
`callback`	a callback to execute upon completion