https://bugs.winehq.org/show_bug.cgi?id=41544
--- Comment #5 from Michael Müller michael@fds-team.de --- I was able to reproduce the problem. With vanilla Wine the issue does not appear, after applying the mentioned patch, the problem shows up. In order to reproduce the issue, start WOT through the launcher, press L + ALT (not ALT + L). You can test it directly in the login screen. It is a bit unreliable and often pressing ALT itself is sufficient.
The application creates the game window with a (invisible/popup?) menu. When you press L + ALT, the invisible menu gets the focus and you should see the system cursor. The patch itself is not really the problem though as notepad++ shows that the application can receive the key press. It seems that the menu code should ignore the event under specific conditions. I didn't have time to debug it further.