Fix extended keys not visible when first shown
Fix extended keys not visible when first shown

Show first the extended keys surface before trying to add QGraphicsItem
into it.

RevBy: Michael Hasselmann, Jon Nordby

develersrl/maliit-demo-qml,maliit/plugins,develersrl/maliit-demo-qml,maliit/plugins,KDE/plasma-maliit-plugins,develersrl/maliit-demo-qml,develersrl/maliit-demo-qml,maliit/plugins,RHawkeyed/plugins,maliit/plugins,KDE/plasma-maliit-plugins,RHawkeyed/plugins,KDE/plasma-maliit-plugins,RHawkeyed/plugins,RHawkeyed/plugins,KDE/plasma-maliit-plugins,RHawkeyed/plugins