wine users - Apr 2011 - [1.3.19] Better support for relative mouse events in DInput ??

"Better support for relative mouse events in DInput."

What exactly does the above update do in new 1.3.19?

I've been moaning for years about stopping
the mouse from leaving an emulated desktop window.
(which would fix many games for me)

Please explain what this update does, thanks!

Jesse