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OK, I know I've seen a solution to this somewhere, but as you can probably guess, a combination of search terms like ubuntu windows desktop give so much noise it doesn't seem to matter what I add to those words - and I can't figure out a way to describe my problem without them :P

The issue is that windows docked to the left or right half of the screen (using either click-and-drag to the screen edge, or Ctrl+Win+arrows) "overflow" into the neighboring desktop (see screenshot below). This means that this window shows up in the alt-tab rotation, constantly causing me to focus on the wrong window, and also that I sometimes push the wrong window to a neighboring desktop when I move around.

I am running Ubuntu 12.04, with a 2-by-2 desktop configuration. I do not use CCSM (and I don't want to). I'd rather just dig down in the config files by hand if I have to (and I have clear instructions on exactly what to do...).

Screenshot (cropped):

Screenshot of overflowing window

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If you open the image in a new tab, the neighbor window is clearly visible in the margin. But I admit, it's hard to see here... –  Tomas Lycken Apr 20 '13 at 16:53
After poking about with this for a while, I seem to remember that the problem is that the window borders are given some extent (1 or 2 px), which cause them to be slightly larger than the window manager expects them to be when they are placed. I remember changing this setting - the width of window borders, or something similar - which fixed the problem. However, I can't find that setting. –  Tomas Lycken Apr 21 '13 at 17:04
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