http://bugs.winehq.org/show_bug.cgi?id=23303
--- Comment #7 from Jonathan Andrews jon@jonshouse.co.uk 2010-06-22 10:50:18 --- Sorry about that - me bad !, im more familiar with X and still feeling my way blindly through win32.
My app was registering a window class of zero (teaches me not to cut&paste from examples !) - fixed now.
Still its interesting that XP with a window class of zero sends a quite a different set of messages to wine. I would expect them to either match much more closely or for wine to send an extra WM_PAINT when the window manager completes a size change as a failsafe for badly behaved apps :-)
Thanks for your help. Jon