Re: Undo after cut of a big region says: No further undo information

[Richard Stallman]

        Richard> I put in this feature because Emacs was crashing due to running
        Richard> out of memory due to a very large undo list.  However, I am
        Richard> somewhat unhappy with the consequence that a single operation 
may
        Richard> be impossible to undo.

Another idea just occurred to me: Emacs could ask for confirmation
before making the current command's undo data longer than a certain
size.  That would give the user the ability to avoid a crash, in the
case I was debugging, while still making it possible to use the commands
that you use.

A further idea is to do this for each integer multiple of that size
value.  So if it is set to 100,000, Emacs would ask about exceeding
100,000 and about exceeding 200,000 and about exceeding 300,000,
etc.

What would you think of that?