Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=58932
-- v2: user32/combo: Adjust MEASUREITEMSTRUCT.itemHeight by 2 instead of 6. comctl32/combo: Adjust MEASUREITEMSTRUCT.itemHeight by 2 instead of 6. comctl32/tests: Add tests for WM_MEASUREITEM with combobox.