Applied patch [ 1218833 ] [wxMSW] wxListBox optimisation for XP

Also removed temporary fix to hardwire listbox background colour


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@34674 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/listbox.h

@@ -151,6 +151,13 @@ protected:
 
     virtual wxSize DoGetBestSize() const;
 
+    // under XP when using "transition effect for menus and tooltips" if we
+    // return true for WM_PRINTCLIENT here then it causes noticable slowdown
+    virtual bool MSWShouldPropagatePrintChild()
+    {
+        return false;
+    }
+
 #if wxUSE_OWNER_DRAWN
     // control items
     wxListBoxItemsArray m_aItems;