Re: turning off (or enhancing) a couple of new features

[Luc Teirlinck]

      The NEWS documents the planned post-release behavior.

   (I don't see this variable mentioned in "~/emacs/etc/NEWS" for

    GNU Emacs 22.0.50.4 (powerpc-apple-darwin7.5.0, X toolkit, Xaw3d
    scroll bars) of 2005-03-24 on hope-of-a-stone.local

   so I'm not sure what you mean.)

The NEWS does not mention the variable, because the variable is mainly
a maintainer debugging tool.  It would of course be trivial to add it
to NEWS, but it will be less relevant after the release than it is now.

What I meant is that the following text:

  +++
  ** When the undo information of the current command gets really large
  (beyond the value of `undo-outer-limit'), Emacs discards it and warns
  you about it.

in NEWS, assumes that the variable has its planned default value of nil.

   It seems to mostly have to do with shell buffers, commands that
   generate lots of output, and yes, editing/manipulating large (I
   wouldn't say huge) text files.

If you kept `undo-outer-limit' at its default value of 3M, I would
suspect problems in undo handling by processes.  (On the other hand,
if you handle 4M files, the warning is not surprising.)  When this
first came up we noticed and dealt with several bugs related to how
timers handled undo.  I told Richard then that I was worried that
there might be similar problems with processes.

What shell commands are involved and are there reproducible examples?

Sincerely,

Luc.