* Make updating of the clone title more of a state-machine - instead
of showing/hiding/creating/raising the title all over the code, have a
single Workspace._updateCloneTitle() method that looks at state bits and
decides if the clone should be hidden or shown, and updates the
stacking and position.
* Move code to positioning of windows within a workspace in the overlay
modeto a new method Workspace._positionWindows()
* Add Workspace.addWindow()/removeWindow() to add and remove windows
from the workspace on the fly. (Triggered manually: we still don't
handle external changes to windows when the overlay is up.)
* Hook up mouse-dragging for window actors and add a
::window-dragged signal to Workspace
* Connect to ::window-dragged for each workspace, compute the new
workspace, move it the window there, and animate everything into the
new position. Snap back to the old location if the window didn't move.
http://bugzilla.gnome.org/show_bug.cgi?id=568753
svn path=/trunk/; revision=164
9b89ba6270