static void AppendNewline(str::Str<WCHAR>& extracted, Vec<RectI>& coords, const WCHAR *lineSep)
{
    if (extracted.Count() > 0 && ' ' == extracted.Last()) {
        extracted.Pop();
        coords.Pop();
    }
    extracted.Append(lineSep);
    coords.AppendBlanks(str::Len(lineSep));
}