No signal "screenAdded"

Hello.

When I run the app with no display connected and then connect it. Or I launch the app with the display connected and then disconnect and reconnect it. For all of these cases, there is no "screenAdded" signal.

This is a serious problem. For example, I want to defer the creation of a QML engine object until the display is connected. But I cannot do this because the "screenAdded" signal is not generated. When trying to create a QML engine object without a connected display, the application terminates, which is not acceptable for an embedded system. In addition, the processing of such completion will no longer be cross-platform.