Re: Message buffer time-stamps

[Richard Stallman <rms@gnu.org>]

    I propose the patch that calls after-change-functions after *Messages*
    buffer modification, i.e. when new messages are added to the
    *Messages* buffer by the `message' function.

That is not safe.  Messages are output from lots of places, and I
don't know if all of them can handle GC.  This patch would cause GCs
in those places.

You could make this safe by checking every call to the `message_'
functions and verifying that GC is safe in each of them.

However, I'd suggest instead using an idle timer to check that a message
has been added, and to add a timestamp.

There is another issue.  Right now there's a feature to combine
repeated messages.  If you put time stamps in the buffer, that would
break this feature, unless the time stamp code takes pains to keep
it working.