https://bugs.winehq.org/show_bug.cgi?id=40060
--- Comment #4 from Dmitry Timoshkov dmitry@baikal.ru --- (In reply to Sergey Isakov from comment #3)
On the other hand let think about the patch. Why it replaces hwnd to null? What is original idea that it must be real handler? Why you decided it is wrong and must be zero?
The patch asks WindowFromPoint() to look for the event target window starting from desktop window instead of the window specified in the message structure.