QmlDesigner: Fix adding keyframe

Keyframes were always added on the selected model node
instead of the modelnode belonging to the property.

Task-number: QDS-12622
Change-Id: Iae44cfecd862d79b14c062854d5f329da595f729
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Qt CI Patch Build Bot <ci_patchbuild_bot@qt.io>
Reviewed-by: Henning Gründl <henning.gruendl@qt.io>

share/qtcreator/qmldesigner/propertyEditorQmlSources/imports/HelperWidgets/ExtendedFunctionLogic.qml

@@ -103,7 +103,7 @@ Item {
                 StudioControls.MenuItem {
                     text: qsTr("Insert Keyframe")
                     enabled: hasActiveTimeline
-                    onTriggered: insertKeyframe(backendValue.name)
+                    onTriggered: backendValue.insertKeyframe()
                 }
             }
         }

src/plugins/qmldesigner/components/propertyeditor/propertyeditorvalue.cpp

@@ -548,6 +548,23 @@ void PropertyEditorValue::setForceBound(bool b)
     emit isBoundChanged();
 }
 
+void PropertyEditorValue::insertKeyframe()
+{
+    if (!m_modelNode.isValid())
+        return;
+
+    /*If we add more code here we have to forward the property editor view */
+    AbstractView *view = m_modelNode.view();
+
+    QmlTimeline timeline = view->currentTimeline();
+
+    QTC_ASSERT(timeline.isValid(), return );
+    QTC_ASSERT(m_modelNode.isValid(), return );
+
+    view->executeInTransaction("PropertyEditorContextObject::insertKeyframe",
+                               [&] { timeline.insertKeyframe(m_modelNode, name()); });
+}
+
 QStringList PropertyEditorValue::generateStringList(const QString &string) const
 {
     QString copy = string;

src/plugins/qmldesigner/components/propertyeditor/propertyeditorvalue.h

@@ -172,6 +172,8 @@ public:
 
     Q_INVOKABLE void setForceBound(bool b);
 
+    Q_INVOKABLE void insertKeyframe();
+
 public slots:
     void resetValue();
     void setEnumeration(const QString &scope, const QString &name);