comctl32/test: test CheckState Macros

[Vitaliy Margolen]

Nikolay Sivov wrote:
> No actually. Native uses ListView_SetItemState for that macro which is
> SNDMSGA in wine and SNDMSG in native.
He asked why his patch is not getting in - that's one of the reasons. You
should always use SendMessageW where possible. Especially for things that
don't care if it's A or W. This is to prevent extra A->W conversions.

Vitaliy.