https://bugs.winehq.org/show_bug.cgi?id=14336
--- Comment #15 from Roman Pisl rpisl@seznam.cz --- I sent a patch https://source.winehq.org/patches/data/142241 that fixes this bug and duplicate 29864. After reading comments in 38298, I tried calling TTN_SHOW between SetWindowPos() and InvalidateRect() and that also fixes the problem. Maybe that would be a better fix?