Mouse focus takes precedence over default focus when opening dash

If the mouse cursor is located in the area where the dash appears when it is opened, and happens to highlight an app/document/etc., this mouse-highlighted action will be performed when pressing enter, rather than the default action (say, opening the most recent app).

Steps to reproduce:

1. Place mouse cursor in a location where it will highlight something in the dash other than the default action
2. Press keystroke to open dash (default: win-key)
3. Press enter

Expected results:
The default action is carried out (opening the most recent app or the first app/document/etc. matching a previous search)

Actual results:
The action highlighted by the mouse cursor is carried out.

Ideally, the mouse cursor should not highlight anything in the dash, until the user moves the mouse. The current behaviour is entirely counter-intuitive, especially if there is a previous search result (in which case the search text is highlighted, further increasing confusion, see also Bug #817436 which may or may nor be related).

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: unity 7.2.2+14.04.20140714-0ubuntu1.1
ProcVersionSignature: Ubuntu 3.13.0-34.60-generic 3.13.11.4
Uname: Linux 3.13.0-34-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.14.1-0ubuntu3.3
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CurrentDesktop: Unity
Date: Wed Aug 20 21:25:29 2014
InstallationDate: Installed on 2012-10-22 (667 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
SourcePackage: unity
UpgradeStatus: Upgraded to trusty on 2014-04-19 (122 days ago)