Verify that QWindow::fromWinId returned a QWindow before using it

Review Request #128260 - Created June 20, 2016 and submitted

Information
Martin Flöser
kwindowsystem
master
08c0215...
Reviewers
kdeframeworks
Foreign window support is not available on all platforms. E.g. on
Wayland this returns a nullptr. Thus we cannot use it.

  
David Faure
Martin Flöser
Review request changed

Status: Closed (submitted)

Change Summary:

Submitted with commit e7249deae417cdf9fb2983b06aa118c4ae4e22df by Martin Gräßlin to branch master.
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