[Bug 2624] In dialogs, an incorrect extra WM_ERASEBKGND is sent after WM_PAINT

https://bugs.winehq.org/show_bug.cgi?id=2624

--- Comment #35 from Artem S. Tashkinov  ---
(In reply to rebe from comment #34)
> How to write a test case for this one-liner patch? How would it get tested?

It's always been here an attachment:  gzip'ed source + exe

To make a testcase out of it, just run it and test the resulting image (a
single pixel will suffice) against what should be.