3-way merge workflow

[Svein Seldal <sveinse seldal com>]

Hi

This is probably answered earlier somewhere, but is there a description 
of how to do a 3-way merge workflow in meld somewhere?
It's very common to have the three columns as YOUR ORIG MINE when 
merging changes from YOUR to MINE, isn't it?
I notice that it's not possible to merge directly from the rightmost 
column to the leftmost, which is something you'd do to merge from YOUR 
to MINE. Hence I'm curious how the workflow of a 3-way merge are 
intended to be done.
(I did try to arrange the columns as YOUR MINE ORIG, but that was 
cumbersome as meld does not clearly show the relationship of YOUR vs 
ORIG, which is often the changes that needs merging.)
Best regards,
Svein Seldal