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/objectnodeinstance.h

@@ -202,6 +202,9 @@ public:
     virtual void setLockedInEditor(bool b);
     bool isLockedInEditor() const;
 
+    bool isComponentWrap() const;
+    void setComponentWrap(bool wrap);
+
     void setModifiedFlag(bool b);
 
 protected:
@@ -234,6 +237,7 @@ private:
     bool m_isModified = false;
     bool m_isLockedInEditor = false;
     bool m_isHiddenInEditor = false;
+    bool m_isComponentWrap = false;
     static QHash<EnumerationName, QVariant> m_enumationValueHash;
 };