public async Task <IList <CompletionItem> > GetCompletion(CompletionTriggerInfo trigger, int position)
{
var groups = await CompletionService.GetCompletionItemGroupsAsync(
GetCurrentDocument(), position, trigger).ConfigureAwait(false);
if (groups == null)
{
return(new CompletionItem[0]);
}
return(groups.SelectMany(t => t.Items).ToArray());
}