QmlDesigner: Delete animations if target is deleted

Task-number: QDS-5221
Change-Id: I98d1a370bf73ef298d3f309d0129b85e2147de6a
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@qt.io>
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

src/plugins/qmldesigner/designercore/model/qmlobjectnode.cpp

@@ -338,6 +338,48 @@ static void removeStateOperationsForChildren(const QmlObjectNode &node)
     }
 }
 
+static void removeAnimationsFromAnimation(const ModelNode &animation)
+{
+    QTC_ASSERT(animation.isValid(), return);
+
+    const QList<ModelNode> propertyAnimations = animation.subModelNodesOfType(
+        "QtQuick.PropertyAnimation");
+
+    for (const ModelNode &child : propertyAnimations) {
+        if (!child.hasBindingProperty("target")) {
+            ModelNode nonConst = animation;
+            nonConst.destroy();
+            return;
+        }
+    }
+}
+
+static void removeAnimationsFromTransition(const ModelNode &transition, const QmlObjectNode &node)
+{
+    QTC_ASSERT(node.isValid(), return);
+    QTC_ASSERT(transition.isValid(), return);
+
+    const auto children = transition.directSubModelNodes();
+    for (const ModelNode &parallel : children)
+        removeAnimationsFromAnimation(parallel);
+}
+
+static void removeDanglingAnimationsFromTransitions(const QmlObjectNode &node)
+{
+    QTC_ASSERT(node.isValid(), return);
+
+    auto root = node.view()->rootModelNode();
+
+    if (root.isValid() && root.hasProperty("transitions")) {
+        NodeAbstractProperty transitions = root.nodeAbstractProperty("transitions");
+        if (transitions.isValid()) {
+            const auto transitionNodes = transitions.directSubNodes();
+            for (const auto &transition : transitionNodes)
+                removeAnimationsFromTransition(transition, node);
+        }
+    }
+}
+
 static void removeAliasExports(const QmlObjectNode &node)
 {
 
@@ -416,6 +458,8 @@ void QmlObjectNode::destroy()
     removeStateOperationsForChildren(modelNode());
     deleteAllReferencesToNodeAndChildren(modelNode());
 
+    removeDanglingAnimationsFromTransitions(modelNode());
+
     QmlFlowViewNode root(view()->rootModelNode());
 
     modelNode().destroy();