Re: Implementing image support for kitty terminal

[Eli Zaretskii <eliz@gnu.org>]

> Date: Fri, 9 Sep 2022 16:10:07 +0200
> Cc: emacs-devel@gnu.org
> From: Gerd Möllmann <gerd.moellmann@gmail.com>
> 
> It wouldn't be hard to buffer the writes until the update is done, I 
> think.

I think we already do, see this part of update_frame_1:

  /* Now update the rest of the lines.  */
  for (i = 0; i < desired_matrix->nrows - 1 && (force_p || !input_pending); i++)
    {
      if (MATRIX_ROW_ENABLED_P (desired_matrix, i))
	{
	  if (FRAME_TERMCAP_P (f))
	    {
	      /* Flush out every so many lines.
		 Also flush out if likely to have more than 1k buffered
		 otherwise.   I'm told that some telnet connections get
		 really screwed by more than 1k output at once.  */
	      FILE *display_output = FRAME_TTY (f)->output;
	      if (display_output)
		{
		  ptrdiff_t outq = __fpending (display_output);
		  if (outq > 900
		      || (outq > 20 && ((i - 1) % preempt_count == 0)))
		    fflush (display_output);
		}
	    }