https://bugs.winehq.org/show_bug.cgi?id=37180
--- Comment #8 from tblodt@icloud.com ---
From the log you attached, there's a lot of WM_MOUSEMOVE and WM_SETCURSOR
events that I ignored. Then there's a WM_LBUTTONDOWN, meaning the mouse click was recieved. Immediately after that, the editor creates a child window. I'm not sure why.
I would love to investigate further. My email address is above this comment. I can't guarantee anything, but I will work on it and report back as soon as I can.