When building with Qt 6 or if qmlpuppet_unifiedRenderPath is set
in the environment we switch to a different render path.
In this case we use QQuickWindow::grabWindow() and render the root item.
No composition is done in the Qt Creator process anymore.
This is a similar approach we already take for the 3D view.
Performance is acceptable and we fix rendering issues related to
effects and layers.
Change-Id: Ic963eca047e0bf16ca3a099ec94658ae2af0fb63
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@qt.io>
29c833d54f