bug#30692: list-buffers has hardwired 80 character width from the 80's

[積丹尼 Dan Jacobson]

LI> It doesn't truncate anything for me when I try it in a wide window.  I
LI> get loooong file names poking out to the right.

Sure the File column has no such problem.

The problem is the Buffer column.

# stty -a|grep columns
speed 38400 baud; rows 39; columns 149; line = 0;
# emacs -q -nw /tmp/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
C-x C-b
CRM Buffer                 Size Mode             File
.   eeeeeeeeeeeeeeee...       0 Fundamental      
/tmp/eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
    *scratch*               145 Lisp Interaction
 %* *Messages*              901 Messages


The trouble really starts when one has lots of
    *sent mail to dd...     219 Message          ~/News/drafts/drafts/51
    *sent mail to da...     329 Message          ~/News/drafts/drafts/52
    *sent wide reply...    1024 Message          ~/News/drafts/drafts/53

indeed one cannot even see one letter of who the last one was sent to.