# File lib/sup/modes/thread-index-mode.rb, line 594
  def reply type_arg=nil
    t = cursor_thread or return
    m = t.latest_message
    return if m.nil? # probably won't happen
    m.load_from_source!
    mode = ReplyMode.new m, type_arg
    BufferManager.spawn "Reply to #{m.subj}", mode
  end