1. more drag and drop and clipboard changes:

a) OLE clipboard works fine
 b) wxBitmapDataObject now accepts DIBs (but doesn't give them back :-( )
 c) bugs in sample corrected
2. wxFatalExit() replaced with wxFAIL_MSG() in bitmap.cpp and dcmemory.cpp
3. wxFrame::ClientToScreen and ScreenToClient() replaced with DoXXX() - like
   this, they don't hide the base class versions


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4039 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/clipbrd.h

@@ -83,10 +83,17 @@ public:
 
     // clears wxTheClipboard and the system's clipboard if possible
     virtual void Clear();
-    
-    /// X11 has two clipboards which get selected by this call. Empty on MSW.
+
+    // flushes the clipboard: this means that the data which is currently on
+    // clipboard will stay available even after the application exits (possibly
+    // eating memory), otherwise the clipboard will be emptied on exit
+    virtual bool Flush();
+
+    // X11 has two clipboards which get selected by this call. Empty on MSW.
     void UsePrimarySelection( bool WXUNUSED(primary) = FALSE ) { }
-    
+
+private:
+    bool m_clearOnExit;
 };
 
 // The global clipboard object