Comment 3 for bug 1068254

That was my thinking on this, too - during the workspace overview, overlay an icon on visible windows to drag to the appropriate workspace. Or is it not possible for Gala to make use of the desktop area during the workspace overview?

Bug #1007684 suggests implementing drag and drop as an alternative (which would replace the Aero Snap behavior.) I don't think that this is an appropriate fix - notably because it works only by "visiting" each workspace in sequence until getting to the intended one - but I'm also biased as I very much appreciate Aero Snap.

I do think that the manual workarounds help, but they're ugly and not very discoverable. They (and the desktop-edge suggestion) are also separate from the workspace overview, which should reasonably handle all things workspaces. Sending a window via the window menu is further inconsistent with the workspace overview in that it doesn't flip the workspace to follow the window.