Re: [T. V. Raman] read-only modes should be using buffer-disable-undo?

[Richard Stallman]

    however the recent updates in simple.el that cause the yes/no dialog 
    to ask about discarding undo information does pop up in shell-mode --- 
    I've had this happen during:

    A) Compilation of alsa (a fairly large compile )
    B) running yum update which produces lots of output
    C) Compiling Emacs from CVS

That surprises me, because this output is just a lot of insertions
in the buffer.  The insertion-undo entries ought to be combined
and not make the undo list grow.

If the undo list is in fact growing, then the question is why.
Can you look at the undo list in such a case and see what it contains?
What sort of entries are they?  What operations made them?

When we see that, we can do one thing or another to make things better.