Code review comment for lp:~feng-kylin/unity/MoveDashToBottom

hi, Marco, I have update the code, and I know that time is running out.
But unfortunately, I found an AP test error in test_wm_keybindings.WindowManagerKeybindingsForWindowHandling.test_right_maximize
and test_left_maximize, the self.screen_win.height didn't match workarea_geo[3].
There is a 2 pixels difference... :/

and BTW, how about the bug of overlapped tooltip ?