Some time ago, Hrvoje Niksic wrote...
|+
| Yikes! Kirill, with your patch, this is also happening under X. It
| bothers me visually. Maybe if the default color were better...
The default color was modeline background. Since default and modeline
backgound are the same shade of gray, dividers were invisible. This is
even worse than black lines, becuase they are supposed to give visual
cues as to where to grab and drag. I think the ideal solution would be
to make them 3-D, as this will give an association with draggable modeline,
like "I can drag stretched 3d object accross their stretch direction".
A 3-D object can also never mimic on the screen.
There might be a separate face for dividers, supplying a color, but I hope
that someone might make 3D dividers. I'm really X challenged, I cannot
(or it would take two weeks...)
Kirill