https://bugs.winehq.org/show_bug.cgi?id=14336
--- Comment #14 from Nikolay Sivov bunglehead@gmail.com --- (In reply to Roman Pisl from comment #13)
This bug https://bugs.winehq.org/show_bug.cgi?id=38298 is also related.
Possibly, but definitely not a duplicate, because BCG code returns 0 for TTN_SHOW, while still touching window size.