public static async Task <CompletionDescription> GetUnimportedDescriptionAsync(Document document, CompletionItem item, ISymbol symbol, CancellationToken cancellationToken)
{
string symbolKey = SymbolCompletionItem.EncodeSymbol(symbol);
item = item.AddProperty(CompletionItemProperties.Symbols, symbolKey);
var description = await SymbolCompletionItem.GetDescriptionAsync(item, document, cancellationToken).ConfigureAwait(false);
// Adding 'unimported' text to beginning
var unimportedTextParts = ImmutableArray <TaggedText> .Empty
.Add(new TaggedText(TextTags.Text, "(unimported)"))
.Add(new TaggedText(TextTags.Space, " "))
.AddRange(description.TaggedParts);
return(description.WithTaggedParts(unimportedTextParts));
}