Re: Undo discard prompt (was: [T. V. Raman] read-only modes should be using buffer-disable-undo?)

[Richard Stallman]

    `undo-outer-limit' may not do a lot of consing, but from the moment
    the question is asked, timers and/or asynchronous processes start
    consing and eating up memory.  If the question gets asked while the
    user is not working at his monitor, eventually all memory gets eaten
    up.

That is a serious problem.  I never considered the possibility
of asynchronous things happening during that question.

I like your new option of displaying a warning, but please keep the
option of asking the question.  At least we need to use it for
testing purposes.