Index: src/app/legend/qgslegend.cpp
===================================================================
--- src/app/legend/qgslegend.cpp	(revision 13576)
+++ src/app/legend/qgslegend.cpp	(working copy)
@@ -377,6 +377,15 @@
     checkLayerOrderUpdate();
     return;
   }
+  
+  // make sure you are able to drag the item
+  // to fix #2711, #2528, #2018
+  QgsLegendItem::DRAG_ACTION action = dest->accept( origin );  
+  if ( action == QgsLegendItem::NO_ACTION && mDropAction != NO_ACTION )
+  {
+    QgsDebugMsg( "Drag NO_ACTION" );
+    return;
+  }
 
   {
     // Do the actual move here.