desktop:fixed mouse area cancle bug

when mouse area move out the monitor which the
desktop show in,
the mouse area must be cancled!

tower:https://tower.im/projects/8f19f0bf0e754f0b82ef2c24bc230973/todos/d62ae8dee2ad492e96d4e7cac3e5566f/?proto=https

Change-Id: Ic23897937783868723a7b0bc1ff1a610fea0151c