As title said, and same for right to left.
So, I have no longer 'border' for my mouse on my left/right side of my screen. Moving mouse do a loop (which seems infinite)

I got this bug since I plugged/unplugged a extra screen, and modified the windows properties of the display options.

I tried disabling DF (shutdown of the service, killing process), and the bug is no longer here, but as soon as I restart DF, it reappear)

Rebooting computer do nothing
Tried to upgrade to beta 8.*, same.

Thanks a lot, it was this.
But I didn't notice it as the French translation is quite messy for this feature. (and I probably set it by mistake)

"Cacher" is wrong, the translations could be be :
"Permettre au curseur de souris de faire le tour de l'écran horizontalement" (for Wrap [...] left/right [...] )
"Permettre au curseur de souris de faire le tour de l'écran verticalement" (for Wrap [...] top/bottom [...] )