When using Super+L keys autohide not working properly

[aproposnix]

When using the super+l keys to lock the screen, the unity panel gets stuck. This happens whenever the user first clicks on the super key and then the L key. Clicking simutaniously works as expected.

The issue was also reported on Ask Ubuntu: http://askubuntu.com/questions/459585/launcher-auto-hide-not-working-ubuntu-14-04/469732?noredirect=1#comment652314_469732

There is a workaround (the user has to double tap the super key) however, this is one of those papercuts that gets rather annoying over time.

I would expect the system to be a little more tolerant in terms of the sequnce of keys pressed. If I first click on the super key and then the L key, the panel will not be locked when I log back in.

===============
Description: Ubuntu 14.04 LTS
Release: 14.04
===============
unity:
  Installed: 7.2.1+14.04.20140513-0ubuntu2
  Candidate: 7.2.1+14.04.20140513-0ubuntu2
  Version table:
 *** 7.2.1+14.04.20140513-0ubuntu2 0
        500 http://archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     7.2.0+14.04.20140423-0ubuntu1.2 0
        500 http://archive.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages
     7.2.0+14.04.20140416-0ubuntu1 0
        500 http://archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages

===========
Screenshot: http://i.imgur.com/e3AePQ8.png

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: unity 7.2.1+14.04.20140513-0ubuntu2
ProcVersionSignature: Ubuntu 3.13.0-30.54-generic 3.13.11.2
Uname: Linux 3.13.0-30-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CurrentDesktop: Unity
Date: Fri Jun 27 09:23:52 2014
InstallationDate: Installed on 2014-03-16 (103 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140313)
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[pabouk (pabouk)]

Another workaround is to use the alternative shortcut without Super: Ctrl+Alt+L

Probably the shortcuts with Super should cancel showing of the Launcher when the other key of the shortcut (like L in Super+L) is pressed.