What's the right way to update Roslyn's Document while typing?

Question

What's the right way to update Roslyn's Document when user is typing new text? Should I call SourceText.WithChanges and then Document.WithText on each char, or is there a more efficient way?

Unfortunately throttling is not an answer, see my question What's the most efficient way to use Roslyn's CompletionSevice when typing? where an API implies that SourceText/Document must be up to date on each char.

Answer 1

Doing SourceText.WithChanges on each character is probably your best bet, assuming there's not a more efficient way you can create your own derived type of SourceText like we do in Visual Studio. (See my answer to your other question for that.) We have done a bit of work to make that not be too inefficient.