User-Agent:       Opera/9.21 (X11; Linux i686; U; de)
Build Identifier: 

Windows which have been behind other windows and have been moved from one workspace to another and back are suddenly placed above all other windows.

Reproducible: Always

Steps to Reproduce:
1. Open two windows
2. Use the right mouse button to move the window behind to another workspace and back
3. See it suddenly in front of the other window

Actual Results:  
The window originally in the background is in in the foreground.

Expected Results:  
The window should stay in the background and keep its z-order.