main menu for dock points to previous app

[anatoly techtonik]

I can't select GIMP main menu after switching from Firefox into dock window. Steps to reproduce:

1. Focus Firefox
2. Switch to GIMP
3. Make sure focus is on dock window (it always on dock in my version, which may be a bug of itself)
4. Try to select File menu

Expected:
  Gimp File menu is opened

Actual:
  Firefox File menu is opened

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: gimp 2.8.10-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-43.72-generic 3.13.11.11
Uname: Linux 3.13.0-43-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.6
Architecture: i386
CurrentDesktop: Unity
Date: Tue Jan 6 15:44:40 2015
InstallationDate: Installed on 2012-03-12 (1030 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta i386 (20120301)
SourcePackage: gimp
UpgradeStatus: Upgraded to trusty on 2014-04-18 (262 days ago)