Steps to reproduce:
1. In Window Manager -> Advanced check "snap windows to
2. Open a window and set it to be always on top
3. Open another window and try nearing it to the previous
First of all sorry for choosing a wrong severity category.
Secondly I forgot to mention that I use the cvs version of Xfce.
windows snap to other windows of the same layer, by moving a window on top, you
put it on an upper layer, thus other windows don't snap to it.
It is not a bug, it's on purpose.