dock:: dock hide problem.

dock will be hidden on auto hide mode when a window is maximized which is not
on primary screen.

reason:
not handle that.

tower: https://tower.im/projects/8f19f0bf0e754f0b82ef2c24bc230973/todos/7d49144fc88f4e3a82a1c5dba23de995/

Change-Id: Ie394f0066b5ffd9884f42de9567f99c00d78f6d9