Crash in BeginPaint running Sams Photofact index, a free VB app

[Mike Hearn]

> Putting in a test would be even better than simply commenting that the 
> behaviour is known for e.g. Win95; it might point out version differences and 
> certainly will catch when we accidentally break the code.

If we add a test for every micro-detail of the APIs, the test cases
would probably be larger than Wine itself. I think sanity checking input
parameters in this way is pretty obvious, for cases where it's not clear
a comment in the code is probably more useful than another test case.