Re: with-temp-buffer: should we set buffer-undo-list to t?

[Noam Postavsky <npostavs@users.sourceforge.net>]

On Sat, Mar 11, 2017 at 6:52 PM,  <raman@google.com> wrote:
> Would setting buffer-undo-list to t in the macro  definition of
> with-temp-buffer help save some work?
>
> At present we dont do this, and as a consequence, operations within
> body of with-tem-buffer may well push entries on the undo stack that
> just get thrown away.

Seems it already happens:

(with-temp-buffer
  buffer-undo-list) ;=> t

get-buffer-create has this code:

  bset_undo_list (b, SREF (name, 0) != ' ' ? Qnil : Qt);

So buffers starting with a space have the undo list set to t.