QmlDesigner: Fix issues with Components and Repeaters

- Fixed state preview rendering by deparenting nodes under
  component wraps.
- Ensure state preview image is always clipped to root item.
  The state preview bounding box broke when Repeater was direct
  child of root and had delegate with rotation.
- Allow dragging items under Repeater to create implicit component.
- Allow dragging Components under Repeater.
- Do not ask for target property when Component is dragged under
  any node.
- Update nodeSource properly when reparenting implicit component
  or removing last child of a Component item.
- Fixed scene update when last child of a repeater is deleted/moved.

Fixes: QDS-5197
Change-Id: Iaaf1745e25db3522ffc1dba7fd1b051da29f5aec
Reviewed-by: Samuel Ghinet <samuel.ghinet@qt.io>
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

share/qtcreator/qml/qmlpuppet/qml2puppet/instances/servernodeinstance.cpp

@@ -150,6 +150,11 @@ bool ServerNodeInstance::holdsGraphical() const
     return m_nodeInstance->isQuickItem();
 }
 
+bool ServerNodeInstance::isComponentWrap() const
+{
+    return m_nodeInstance->isComponentWrap();
+}
+
 void ServerNodeInstance::updateDirtyNodeRecursive()
 {
     m_nodeInstance->updateAllDirtyNodesRecursive();
@@ -280,6 +285,8 @@ ServerNodeInstance ServerNodeInstance::create(NodeInstanceServer *nodeInstanceSe
 
     instance.internalInstance()->setInstanceId(instanceContainer.instanceId());
 
+    instance.internalInstance()->setComponentWrap(componentWrap == WrapAsComponent);
+
     instance.internalInstance()->initialize(instance.m_nodeInstance, instanceContainer.metaFlags());
 
     // Handle hidden state to initialize pickable state