I'm not sure what you mean. Are you asking whether the gap I described is actually part of the panel? If so, no, it doesn't seem so. It's definitely inside the workspace switcher. I'm attaching a new screenshot which shows the gap again, but now on a panel with a height of 48 pixel. The window in the shot (epiphany) is maximized.
** Attachment added: "New shot with bigger gap" http://librarian.launchpad.net/4272354/switcher-gap-big.png -- [edgy] Workspace switcher: Maximized windows have one pixel gap https://launchpad.net/bugs/60447 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs