Implementation of the User32.PrintWindow

[Nikolay Sivov]

Josselin Bardet wrote:
> Hi,
>
> As next of the discussion on the bug 18772
> (http://bugs.winehq.org/show_bug.cgi?id=18772), I send here the
> implemenation for User32.PrintWindow function
>
> I've tested it with an application that was crashing because of this
> unimplemented function.
>
> Regards
> Jos
As I already said in bugzilla:
- use SendMessageW
- add FIXME for unused flags or use them
- no need for brackets around SendMessage
- add a simple test (if native send this message - you can check it 
easily with Spy in Windows)