https://bugs.winehq.org/show_bug.cgi?id=12007
--- Comment #18 from Austin English austinenglish@gmail.com --- (In reply to Sergey Isakov from comment #16)
(In reply to Sebastian Lackner from comment #13)
Patch added to the staging tree: https://github.com/wine-compholio/wine-staging/blob/master/patches/user32- Mouse_Message_Hwnd/0001-user32-Try-harder-to-find-a-target-for-mouse-message. patch
It's a pity this patch is wrong in my case. It leads to another bug: when a game crashes the a dialog window appeared "Program Error" with two buttons "Show details" and "Close". These button are no more clickable because of this patch. Reverting it resolves the issue.
FYI, winetricks nocrashdialog will disable that dialog for you (obviously it won't prevent the crash though :) ).