RFC: Patch for making GrabPointer work

[Dmitry Timoshkov]

"Alexandre Julliard" <julliard at winehq.com> wrote:

> Jukka Heinonen <jhei at iki.fi> writes:
> 
> > Storing old windows procedure in struct x11drv_win_data
> > would remove the worst race, but unless window
> > procedure update is atomic, it would not remove
> > all races.
> 
> Since you have the window locked when changing the wnd proc the update
> will be atomic. The only problem I see is that your wnd proc might get
> called to process some other message, but you can solve this by having
> it chain to the previous wnd proc for all messages except the special
> one.

And it would be much better to not hardcode 0x7777 as the special message
value, but use RegisterWindowMessage instead.
--
Dmitry.