From 7c5ff7cec9d85d10e1702ec4552a6202571dfa78 Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Mon, 6 May 2013 15:34:56 +0200
Subject: [PATCH] Do not allow to drag and drop child items of non-group
 objects in tree view

---
 src/Gui/Tree.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/Gui/Tree.cpp b/src/Gui/Tree.cpp
index c2b3284455..a10cf015b3 100644
--- a/src/Gui/Tree.cpp
+++ b/src/Gui/Tree.cpp
@@ -340,6 +340,15 @@ QMimeData * TreeWidget::mimeData (const QList<QTreeWidgetItem *> items) const
             doc = obj->getDocument();
         else if (doc != obj->getDocument())
             return 0;
+        // Now check for object with a parent that is an ObjectType, too.
+        // If this object is *not* a group we are not allowed to remove
+        // its child (e.g. the sketch of a pad).
+        QTreeWidgetItem* parent = (*it)->parent();
+        if (parent && parent->type() == TreeWidget::ObjectType) {
+            App::DocumentObject* par = static_cast<DocumentObjectItem *>(parent)->object()->getObject();
+            if (!par->getTypeId().isDerivedFrom(App::DocumentObjectGroup::getClassTypeId()))
+                return 0;
+        }
     }
     return QTreeWidget::mimeData(items);
 }