Ubuntu
unity package

  1. Bug #876017
  2. Comment #4

Comment 4 for bug 876017

Revision history for this message
Sebastien Bacher (seb128) wrote : Re: We should be able to close windows in spread mode

That got some design work, you can read about it there:
http://design.canonical.com/2012/03/task-switching-in-ubuntu-and-a-introduction-to-the-spread/

the blog mentions that

"Moving the pointer over any of the previews will display the window name in a window title bar, and a close button is included so that any window can be dismissed directly from this view."