I saw some screenshots by the Wine Staging team [7, 8] and it was terrible. By the way, someone asked me why does the existing implementation suck. Just look at the screenshots [7] and [8] again. This is the limit of what can be done by replacing the uxtheme.dll implementation. If you want more, comctl32 should be fixed.
This is my experience running Adwaita: https://airwebreathe.org.uk/lib/exe/fetch.php?media=space:20160426-wine-gtk-... .
- Clipped tab edges - Clipped check boxes - Clipped slider handle
It looks a bit better if I boost the DPI so that the font size matches the rest of the desktop. But the clipping issues don't go away.
Joel