https://bugs.winehq.org/show_bug.cgi?id=56029
--- Comment #1 from John Found johnfound@asm32.info --- I just now found that this bug is similar to the bug reported by me earlier:
https://bugs.winehq.org/show_bug.cgi?id=45385
The difference is only that it was related to keyboard modifier keys, now it is about the mouse buttons.
But in general, the behavior is very similar. And possibly the source of both bugs is the same.