Make it possible to call grabToImage() on Window.contentItem

Window.contentItem was not associated with any QQmlContext and
QQmlEngine. A valid pointer to QQmlEngine is needed for callback
function execution.

Task-number: QTBUG-57175
Change-Id: Iab7730bfc8860521ff2e8c1631a11d0e1fe0cf94
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

1 files changed, 15 insertions, 0 deletions

diff --git a/tests/auto/quick/qquickwindow/data/grabContentItemToImage.qml b/tests/auto/quick/qquickwindow/data/grabContentItemToImage.qml
new file mode 100644
index 0000000000..9086e0cc84
--- /dev/null
+++ b/tests/auto/quick/qquickwindow/data/grabContentItemToImage.qml
@@ -0,0 +1,15 @@
+import QtQuick 2.0
+import QtQuick.Window 2.2 as Window
+
+Window.Window {
+    visible: true
+    width: 100
+    height: 100
+    property int success: 0
+
+    function grabContentItemToImage() {
+        contentItem.grabToImage(function (image) {
+            success = 1
+        })
+    }
+}