https://bugs.winehq.org/show_bug.cgi?id=51137
--- Comment #11 from Lorenzo Ferrillo lorenzofer@live.it --- @Zhiyi Zhang Confirming the this patch series fix this bug. (pulled into my the tkg build as userpatches)
[PATCH 5/5] uxtheme: Support scroll bar state tracking in non-client areas. [PATCH 4/5] uxtheme: Support pressed state for themed scroll bars. [PATCH 3/5] uxtheme: Support drawing themed standard scroll bars. [PATCH 2/5] uxtheme: Move themed dialog to uxtheme. [PATCH 1/5] uxtheme: Move themed scroll bar to uxtheme.