[PyQt] Simple qml app hanging with PyQt5.7 x86_64 wheel on linux

[Russell Warren]

>
> I don't think it has anything to with the wheels. It works fine if you use
> QQuickView. It would be interesting to see what a C++ version of the
> launcher would do.
>

You are right.  The problem was entirely mine. It was that using
QQmlApplicationEngine needs a visible root Window in the qml.

fwiw, this works fine with that launcher:

import QtQuick 2.3
import QtQuick.Window 2.2

Window {
    visible: true
    Rectangle {
        width: 200
        height: 100
        color: "red"
        Text {
            anchors.centerIn: parent
            text: "Hello, World!"
        }
    }
}
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