fix order of ops mangling useGroupCenter snapping

Engine/source/gui/worldEditor/gizmo.cpp

@@ -961,11 +961,11 @@ void Gizmo::on3DMouseDragged( const Gui3DMouseEvent & event )
          mDeltaTotalPos = projPnt - mMouseDownProjPnt;
          newPosition = mSavedTransform.getPosition() + mDeltaTotalPos;
 
-         mDeltaPos = newPosition - mTransform.getPosition();
-
          if (mProfile->snapToGrid)
             newPosition = _snapPoint(newPosition);
 
+         mDeltaPos = newPosition - mTransform.getPosition();
+
          mTransform.setPosition( newPosition );
 
          mCurrentTransform.setPosition( newPosition );