StackView: add tests to check that Qt.binding works with push()

This is documented to work, but only works with QML properties, so
expect failures until it's fixed to work with JS variables.

Task-number: QTBUG-112605
Task-number: QTBUG-114959
Pick-to: 6.5 6.6
Change-Id: Idc55d5954172cdfe53a69f0598807638533480f9
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

tests/auto/quickcontrols/controls/data/tst_stackview.qml

@@ -367,6 +367,8 @@ TestCase {
         verify(control.get(2, StackView.ForceLoad))
     }
 
+    property bool qmlProperty
+
     function test_push() {
         var control = createTemporaryObject(stackViewComponent, testCase)
         verify(control)
@@ -420,6 +422,27 @@ TestCase {
         compare(item6.objectName, "6")
         compare(control.depth, 6)
         compare(control.currentItem, item6)
+
+        // push([component, {binding}]) - with JS variable in binding
+        var jsVariable = false
+        var item7 = control.push([itemComponent, {objectName: Qt.binding(() => {
+            return jsVariable.toString() })}], StackView.Immediate)
+        compare(item7.objectName, "false")
+        compare(control.depth, 7)
+        compare(control.currentItem, item7)
+        jsVariable = true
+        expectFailContinue("", "QTBUG-114959")
+        compare(item7.objectName, "true")
+
+        // push([component, {binding}]) - with QML property in binding
+        qmlProperty = false
+        var item8 = control.push([itemComponent, {objectName: Qt.binding(() => {
+            return testCase.qmlProperty.toString() })}], StackView.Immediate)
+        compare(item8.objectName, "false")
+        compare(control.depth, 8)
+        compare(control.currentItem, item8)
+        qmlProperty = true
+        compare(item8.objectName, "true")
     }
 
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