Rootless mode only works on one monitor

[Jehan]

Harold L Hunt II wrote:

> Yes, we should look into doing something that would allow rootless-mode
> windows to be placed anywhere on the virtual display area.  I think that
> may only require setting the size of the fake Windows-window to the size
> of the virtual display region.  Should be easy, right? ;)

Getting all the desktops is easy with EnumDisplayMonitors.

The problem is the non rectangular shape. One desktop could be 1280x1024 
while the other is 640x480, so there would be a non visible area that 
could be pretty annoying, especially with WM that have "smart placement".

	Jehan