Object Viewer: Disable Promotion of Open Object Dialog to Object Viewer
Bug Number: n/a
Release notes (y/n): no
For Release Nums: 7.1

The current implementation does allow -- but we are disabling -- the 
dragging of an Object Tab (and an Open Object Dialog Object Icon Button) 
into ANY Open Object Dialog.

This is now disabled with this compile time symbol in Q3GUI/OpenObjectDlg.cpp:
 static const bool ENA_OPEN_OBJ_PROMOTION_TO_VIEWER (false); // 7.1: false