Comment 11 for bug 137134

Yes it is still happening in both Gutsy and Hardy. While testing I found the possible cause of the problem. When I resize the window it is very well possible to push the active part of the window border (where you can grab it with the mouse) to the next workspace on the cube. Rotating the cube makes the active part of the border visible again, so you can push it back to the original workspace.
Maximizing the size of the window helps in Gutsy, because it brings all borders completely on the correct workspace. In Hardy a maximized window does not seem to have active borders at all, so the trick to maximize the window and then resize does not work.
In my opinion it should not be possible to push the border of a window to the next workspace.
In case it may be relevant, I am using the Human theme and gtk-window-decorator on both my Gutsy and my Hardy system.