Feature request: please add 4th pane support when 3 way merging.

[Kevin Gao <kkegao gmail com>]

Kdiff3 / gvim and other popular merge tools have 4th pane when doing 3 way merge (in git).

Could you please add 4th pane please? (The 4th pane in the bottom)

Kdiff3 is the only KDE software on my machine, which eats 300MB disk :(

Thanks,