Feature wish: Snap windows to edges when moving them with the mouse

[Kai Großjohann]

Metacity has a nice feature where you can hold Shift while moving a
window with the mouse, and the window will snap to edges (screen edges
and other window edges).

Openbox has the even nicer feature of MoveToEdge{North,South,East,West},
but I think that the mouse-based feature that Metacity has would be a
nice complement.

Kai