Desktop environments that allow Drag'n'Drop across applications via Alt-Tab

Question

Which desktop environments allow to drag'n'drop files/data across applications while task-switching using Alt-Tab (without the need to move mouse cursor to a specific UI element and/or wait for other UI elements to become active)?

To the best of my knowledge:

Working

• Unity 2D of Ubuntu 11.04 (as using Metacity)
  https://askubuntu.com/questions/44168/does-dragndrop-across-applications-while-switching-tasks-via-alt-tab-work-in-un

• xmonad on Kubuntu 11.04 (as of answer below, thanks)

Not working:

• Unity (3D) of Ubuntu 11.04 (as using Compiz)
  Drag and Drop across (fullscreen) applications, switching via Alt-Tab

• Unity 2D of Ubuntu 11.10

• Unity (3D) of Ubuntu 11.10

• gnome-shell of Ubuntu 11.10

Answer 1

It does work in Xmonad running on Kubuntu 11.04 - I'm not sure whether XMonad or KWin responsible for Drag'n'Drop behaviour in this case.