- Initially set state (and type, and flags) in response to PlatformSurfaceCreated.
We know reliably this will run before the window is mapped.
- Drop the comment about removing setState() form showEvent handler, as
we need it to avoid state loss in this scenario:
<mgraesslin> the window gets mapped first time: everything is fine
<mgraesslin> window gets unmapped: kwin removes the state as per spec
<mgraesslin> qt gets change event and removes the states it doesn't care about
<mgraesslin> qt maps window again and sets states
<mgraesslin> we lost the state
<mgraesslin> which means we need to set the state again from our side before(!) Qt sets it
<mgraesslin> and before Qt maps the window
