https://bugs.winehq.org/show_bug.cgi?id=41062
--- Comment #18 from Esme Povirk madewokherd@gmail.com --- Created attachment 70494 --> https://bugs.winehq.org/attachment.cgi?id=70494 possible fix
Looking at WM_TAKE_FOCUS code, it will ignore the request if WM_MOUSEACTIVATE returns MA_NOACTIVATE. That means handling the message is a possible fix.
Is it acceptable for Wine's tooltip control to do this? Under normal circumstances on Windows, this message should never be sent to a tooltip, so it's likely that native does not do this.