Comment 10 for bug 1051921

Actually, it doesn't seem to be fixed in Precise. This is the latest changelog entry of the current Precise version:

unity (5.20.0-0ubuntu3) precise-proposed; urgency=low

  * Add initial support for pointer barriers with xinput2 api. (LP: #1242633)
    - Fallback to xfixes stays available.
  * Bump dependencies to compile with both pointer barriers implementations.

 -- Maarten Lankhorst <email address hidden> Thu, 05 Sep 2013 11:58:32 +0200

It's 0ubuntu3 as the one in the proposed patch, but it's actually a completely different entry, referencing a different bug.