Jacek Caban (@jacek) commented about dlls/user32/tests/msg.c:
+ SetRectRgn( hrgn_old_vis, rect_old_vis.left, rect_old_vis.top, rect_old_vis.right, rect_old_vis.bottom ); + IntersectRect( &rect_new_vis, &rect_new, &rect_parent_clip ); + SetRectRgn( hrgn_new_vis, rect_new_vis.left, rect_new_vis.top, rect_new_vis.right, rect_new_vis.bottom ); + + if (!EqualRect( &rect_old, &rect_new ) || is_zorder_redraw) + { + CombineRgn( hrgn_expect, hrgn_old_vis, hrgn_new_vis, is_composited ? RGN_OR : RGN_DIFF ); + } + else + { + SetRectRgn( hrgn_expect, 0, 0, 0, 0 ); + } + + rgn_equal = EqualRgn( hrgn_expect, hrgn_actual ); + if (!rgn_equal && broken( has_parentdc_anomaly && is_composited && + LOBYTE(LOWORD(GetVersion())) < 8 ) /* Win7 */) Please don't use GetVersion() in tests. Also, working around broken behavior is not really useful if we're not interested in results anyway. You may just win_skip() those cases.
-- https://gitlab.winehq.org/wine/wine/-/merge_requests/363#note_11067