Player is moving left on mouse move
When moving the mouse up or down, the player also moves to the left slightly. Easily observed by looking straight up at a fixed point and trying to move the view beyond what is possible for a little while.
(RM-726 from redmine: created on 2013-04-19 by Lars Söderberg, , closed on 2013-07-28 by nobody, duplicates #774 (closed))
Edited by redmine