Workspace switcher selection needs double-click

To switch workspace/desktop it currently needs 3 clicks - unnecessarily.

First click is to show workspaces as thumbnails, then to select a particular workspace/desktop it needs a double-click. As a single click does not provide any further functionality a single click on the thumbnail should be sufficient to switch to the selected workspace/desktop. Currently a double-click is needed.

Interestingly using a right-click immediately switches to the selected desktop - which I only discovered by accident when thinking that a single click to a desktop might bring up a context menu with a right-click - but it does not.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity 5.14.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-29.46-generic 3.2.24
Uname: Linux 3.2.0-29-generic x86_64
ApportVersion: 2.0.1-0ubuntu12
Architecture: amd64
CompizPlugins: [core,composite,opengl,decor,gnomecompat,regex,compiztoolbox,place,widget,move,imgpng,animation,workarounds,snap,grid,expo,vpswitch,session,commands,resize,mousepoll,unitymtgrabhandles,ezoom,wall,switcher,fade,scale,unityshell]
Date: Tue Aug 21 11:54:07 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)