Make sure that we Qt::WA_InputMethodEnabled is set on the QGraphicsView *before* we send the FocusInEvent

Today when a QGraphicsItem receives a FocusInEvent, the QGraphicsView still does not have the Qt::WA_InputMethodEnabled flag. This is a problem. For some frameworks (e.g. Orbit) they need to notify the IM framework that the focus has changed, and that is done by calling QInputContext::setFocusWidget() (with the graphics view as the widget argument) when focus changed inside graphicsview. Calling that function with a widget that does not have the Qt::WA_InputMethodEnabled attribute set will make it assert.