[TRY 2] user32/tests: Add tests for STM_SETIMAGE and STM_SETICONmessage processing

[Dmitry Timoshkov]

"Ilya Shpigor" <shpigor at etersoft.ru> wrote:

> Subject: [TRY 2] user32/tests: Add tests for STM_SETIMAGE and STM_SETICONmessage processing

Do these tests pass on Wine? If not you need to use todo_wine in
appropriate places, or post a fix as [1/2] and the tests as [2/2].

Also, please add a check that once first SendMessage which sets
an image, next SendMessage returns that image, i.e. that the first
SendMessage succeeds.

-- 
Dmitry.