messages-buffer-max-lines (was: The emacs_backtrace "feature")

[Juri Linkov]

>> something like 40 will cover most cases.
>
> OK, thanks, I did that in trunk bzr 110259.

Thanks, 40 should be enough.  There is a similar problem with
`messages-buffer-max-lines' (`message-log-max') whose default value
100 is too small.  Often while debugging a problem in `emacs -Q'
it truncates lines in the *Messages* buffer, so I have to set it
to a higher number and redo all tests from the beginning.

Actually I see no reason to truncate *Messages* at all, but at least
if it should be a number, please increase it to a number one order of
magnitude higher (e.g. 1000) that won't cause frequent problems.

PS: Previous discussion 5 years ago:
http://lists.gnu.org/archive/html/emacs-devel/2007-04/msg00276.html