* Move window between activities
1) Setup desktop with two activities, taskbar and activity pager, test window on one activity, activate activity with the window on it
2) Drag window's taskbar entry to the other activity's pager item.
3) Observe window moves to other activity
* Add window to another activity
1) Setup remaining from previous test
2) Ctrl-drag window's taskbar entry to the other activity's pager item.
3) Observe window is now on all activities
* Move window from all activities to a single activity
1) Setup remaining from previous test. Window is on all activities
2) Drag window's taskbar entry to an activity pager item
3) Observe window is now only on one activity
* Add window to two out of three activities
1) Setup remaining from previous test. Window is on 1/2 activities
2) Add 3rd activity using Activity Manager
3) Ctrl-drag window's taskbar entry to the new activity.
4) Observe window is now on 2/3 activities
* Move window to a different 2/3 activities
1) Setup remaining from previous test. Window is on 2/3 activities
2) Activate an activity the window is present on
3) Drag window's taskbar entry to the activity it is not on
4) Observe window is now moved to the activity it was dropped on, and is no longer on the current activity
* Add window to the only activity it is not on
1) Setup remaining from previous test. Window is on 2/3 activities
2) Activate an activity the window is present on
3) Ctrl-drag window's taskbar entry to the activity it is not on
4) Observe window is now present on all activities