Issue description
Sometimes free look mode stop working properly.
Activating it only shifts the viewport slightly if the mouse is moved slowly, otherwise nothing happens.
Tabbing out seems to either cause the issue, or temporarily fixes it but it returns in the same time with no focus changes.
Reproduction steps
Try to use free look after sweapping focus to another window?
Game version and build number
v0.6.4a b339
Operating system
Linux