Some things in Google's API are 1-based but MS want 0-based. Shouldn't have to remember when to do this and when not. See [TODO](https://github.com/DanTup/Dart-Code/blob/aa4f717792382c896d86ce4e698ef54f444e3695/src/dart_workspace_symbol_provider.ts#L29) and [TODO](https://github.com/DanTup/Dart-Code/blob/51c051163a49802ef0bd9fe5bfcaab6701756243/src/dart_diagnostic_provider.ts#L25)