This bug was fixed in the package unity-tweak-tool - 0.0.6ubuntu2
--------------- unity-tweak-tool (0.0.6ubuntu2) utopic; urgency=medium
* Backport upstream commit adding support for minimizing single window applications when clicking their icon on the launcher (LP: #1298487). -- Andrew Starr-Bochicchio <email address hidden> Thu, 27 Mar 2014 12:39:22 -0400
This bug was fixed in the package unity-tweak-tool - 0.0.6ubuntu2
---------------
unity-tweak-tool (0.0.6ubuntu2) utopic; urgency=medium
* Backport upstream commit adding support for minimizing
single window applications when clicking their icon on
the launcher (LP: #1298487).
-- Andrew Starr-Bochicchio <email address hidden> Thu, 27 Mar 2014 12:39:22 -0400