I don't think it's possible since floating windows are not in a layout,
but if you ever achieve it please let me know. What I do is:

Since I don't use borders because I keep track of the focus using FadeInactive
I actually set the border width and customize the colors so my floating windows get distinguishable borders.
Then I use noBorders layout modifier to get rid of it on tiled windows.

Regards,
Henrique G. Abreu


On Sat, May 29, 2010 at 02:09, Nathan Huesken <xmonad@lonely-star.org> wrote:
Hi,

Is it possible to give only floating winows a decoration?
Like, enable it when a window becomes floating, disable it when it gets
back to non floating?

Thanks!
Nathan
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