QQuickView::SetSource doesn't set the parent immediately

when loading a qml file with QQuickView::setSource, at he time the item executes Component.onCompleted the item still has no parent, only afterwards it will be set to QQuickWindow::contentItem(), but code that relies on a parent and a window to be there at item creation, like QtQuickControls Dialog will be broken.

so if a Dialog is created inside an item loaded this way, calling open() on it will have no effect.

The problem can be kinda worked around by doing

setInitialProperties(QStringLiteral("parent"), QVariant::fromValue(contentItem()));

prior to setSource