I've discovered how to reproduce this without messing with
gnome-terminal settings.  Start by passing a very wide parameter to
multitail:

  multitail -sw 500,10 -R 15 -l ls -R 45 -l ls

This (correctly) gives an error which indicates the width limit:

   --*- multitail 5.2.2 (C) 2003-2007 by folk...@vanheusden.com -*--
   A problem occured at line 511 in function mynewwin (from file term.c):
   Failed to create window with dimensions -358x39 at offset 500,0 (terminal 
size: 142,40)
   Binary build at Dec 10 2009 22:50:55

So the reported limit is 142.  If I choose 136 (as follows) it works:

  multitail -sw 136,10 -R 15 -l ls -R 45 -l ls

But if I choose 137, it segfaults:

  multitail -sw 137,10 -R 15 -l ls -R 45 -l ls

If you go just under 142, it fails with a different kind of error.
E.g:

  multitail -sw 139,10 -R 15 -l ls -R 45 -l ls

results in:

  multitail: utils.c:418: shorten_filename: Assertion `max_len >= 0' failed.
                                                                          
Aborted

So you need to test the boundaries.  I would say the filename error
above is also a bug, although less severe than a segfault.



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