I think I'd consider that a bug, and it's probably easy enough to fix it. This is a guess based on reading the source, so you should verify for yourself whether this changes things appropriately, but...

In XMonad.Layout.ThreeColumns.split3HorizontallyBy, swap the second two elements of the triple in the True branch, so that it reads:

    then ( Rectangle (sx + fromIntegral r3w) sy r1w sh

         , Rectangle sx sy r3w sh

         , Rectangle (sx + fromIntegral r3w + fromIntegral r1w) sy r2w sh )

~d

On Tue, Oct 18, 2016 at 12:02 AM, Eyal Erez <oneself@gmail.com> wrote:

Hi,

I have an ultrawide monitor and so I use ThreeColumns most of the
time.  I create it like so:

    ThreeColMid 1 (3/100) (1/3)

This works fine, however, I'm getting some strange behavior when
creating an closing windows.  I hope I can explain this with a small
diagram which shows window location as I create and close apps:

CREATE
1 [   a   ]
2 [b][ a  ]
3 [a][c][b]

CLOSE
1 [a][c][b]
2 [b][ a  ]
3 [   a   ]

So, when going from 2 to 3 open windows, window "a" and "b" switch
location for some reason. in step #2 "b" is on the left and "a" is on
the right, but when a third window is added (or removed) they swap
locations.  This is very confusing.

Is there anyway I can cause this to stop happening?  It would also be
nice if window "b" was created into the active location, but that's
more of a nitpick.

Thank you

-- 
There are 10 types of people, those who know binary and those who don't.

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