[Merge] lp:~lukas-kde/qtubuntu/fixWheel into lp:qtubuntu

[Daniel d'Andrada]

Review: Needs Fixing

Not specifying the window only for wheel events make the code inconsistent. So mouse movement can go to a window A but mouse wheel events to a window B.

It also breaks the contract of the method dispatchPointerEvent. Its first parameter is the QWindow where events are supposed to go to. It should obey it.
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https://code.launchpad.net/~lukas-kde/qtubuntu/fixWheel/+merge/276251
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