Do I need that for the 1,4 and 8bpp tests? With my patch to GdipGetNearestColor these tests pass and behave like Windows 7. I did forget a todo_wine on the 16bpp grayscale test though...
The tests should pass independently after each patch in the series is applied. The todo_wine's are in case the first patch is accepted and the second is not.
You'll have to remove the todo_wine's from the newly-succeeding tests in your second patch, of course.