Added DuplicateScreen using QML project

DuplicateScreenQML/DuplicateScreenQML.pro

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+QT += quick
+
+CONFIG += c++11
+
+# The following define makes your compiler emit warnings if you use
+# any Qt feature that has been marked deprecated (the exact warnings
+# depend on your compiler). Refer to the documentation for the
+# deprecated API to know how to port your code away from it.
+DEFINES += QT_DEPRECATED_WARNINGS
+
+# You can also make your code fail to compile if it uses deprecated APIs.
+# In order to do so, uncomment the following line.
+# You can also select to disable deprecated APIs only up to a certain version of Qt.
+#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0
+
+SOURCES += \
+        main.cpp
+
+RESOURCES += qml.qrc
+
+# Additional import path used to resolve QML modules in Qt Creator's code model
+QML_IMPORT_PATH =
+
+# Additional import path used to resolve QML modules just for Qt Quick Designer
+QML_DESIGNER_IMPORT_PATH =
+
+# Default rules for deployment.
+qnx: target.path = /tmp/$${TARGET}/bin
+else: unix:!android: target.path = /usr/sbin/novin/
+!isEmpty(target.path): INSTALLS += target

DuplicateScreenQML/main.cpp

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+#include <QGuiApplication>
+#include <QQmlApplicationEngine>
+#include <QQuickView>
+
+int main(int argc, char *argv[])
+{
+    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
+
+    QGuiApplication app(argc, argv);
+
+    QQmlApplicationEngine engine;
+
+    const QUrl url(QStringLiteral("qrc:/main.qml"));
+    QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,
+                     &app, [url](QObject *obj, const QUrl &objUrl) {
+        if (!obj && url == objUrl)
+            QCoreApplication::exit(-1);
+    }, Qt::QueuedConnection);
+    engine.load(url);
+
+    return app.exec();
+}

DuplicateScreenQML/main.qml

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+import QtQuick 2.12
+import QtQuick.Controls 2.12
+import QtQuick.Window 2.12
+
+Item{
+
+    Loader{
+        id: source
+        sourceComponent: ApplicationWindow{
+            id: appWindow
+            width: 800
+            height: 800
+            onFrameSwapped: {
+                    windowContent.grabToImage(function(result) {
+                        secondWindow.frame = String(result.url);
+                    });
+                }
+
+            visible: true
+            screen: Qt.application.screens[0]
+
+            Component.onCompleted: {
+                showFullScreen()
+                appWindow.frameSwapped()
+            }
+
+            Item{
+                id: windowContent
+                width: parent.width
+                height: parent.height
+
+                Label{
+                    anchors.centerIn: parent
+                    font.pointSize: 24
+                    text: "1"
+                }
+
+                Item {
+                    id: foo
+                    width: 100; height: 100
+                    Rectangle { x: 5; y: 5; width: 60; height: 60; color: "red" }
+                    Rectangle { x: 20; y: 20; width: 60; height: 60; color: "orange" }
+                    Rectangle { x: 35; y: 35; width: 60; height: 60; color: "yellow" }
+                }
+
+                Button{
+                    anchors.verticalCenterOffset: 24
+                    anchors.centerIn: parent
+                    text: "Test Button"
+                    onClicked: {
+                        visible= false
+                    }
+                }
+            }
+
+
+            Window{
+                id: secondWindow
+                visible: true
+                screen: Qt.application.screens[1]
+
+                property alias frame: frameImage.source
+
+                Image {
+                    id: frameImage
+                }
+
+                Component.onCompleted: {
+                    showFullScreen()
+                }
+            }
+        }
+    }
+
+
+}

DuplicateScreenQML/qml.qrc

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+<RCC>
+    <qresource prefix="/">
+        <file>main.qml</file>
+    </qresource>
+</RCC>