In that bug you linked it says that the bug was fixed in the package unity 7.3.2+15.10.20150910.1-0ubuntu1, which was released for Wily not Trusty.
In that bug you linked it says that the bug was fixed in the package unity 7.3.2+15. 10.20150910. 1-0ubuntu1, which was released for Wily not Trusty.