private ReadOnlySpan <char> AppendNewline(ReadOnlySpan <char> chars)
{
m_buffer.Clear();
m_buffer.Fill(chars.Length + Environment.NewLine.Length, default);
chars.CopyTo(m_buffer.AsSpan());
Environment.NewLine.AsSpan().CopyTo(m_buffer.AsSpan().Slice(chars.Length));
return(m_buffer.AsSpan());
}
