remove deleted windows from motionmanagers
Review Request #126034 - Created Nov. 11, 2015 and submitted
Eg. if a window is closed while "timeline.currentValue() == 0", slotWindowClosed() will shortcut exit and not be removed from the managers, thus dangle around forever. Maybe there're other ways for a window to be deleted w/o the closed slot being entered.
none, this is a guess on why those crashes occur
I'm wondering why we kept it in the list on the first place? Maybe to make an animation work on closing the window? If that's not an issue: ShipIt, cannot hurt to do additional safety checks.