[Merge] lp:~mir-team/qtubuntu/port-to-mirclient into lp:qtubuntu

[Albert Astals Cid]

Review: Needs Information

in
  extract_buttons(const MirPointerInputEvent *pev)
why not make q_modifiers a Qt::MouseButton instead of an int so you can save the last static_cast?

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https://code.launchpad.net/~mir-team/qtubuntu/port-to-mirclient/+merge/245164
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