unity-2d display custom icons in launcher, but not for ALT+TAB

[James Hunt]

To recreate,

1) Login to unity *3D*
2) Create a .desktop file for your application in ~/.local/share/applications/foo.desktop, specifying a valid 'Icon=' key.
3) Run your application
4) Observe that the icon is displayed in the launcher.
5) Observe that the icon is displayed when you type ALT+Tab.
6) Switch to unity *2D*.
7) Observe the icon is correctly displayed in the launcher.
8) PROBLEM: observe that the icon is NOT displayed when you ALT+Tab.

In unity-2d, ALT+Tab shows the default/broken icon symbol (black square with red circle with line through it).

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity-2d 4.12.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-2.5-generic 3.2.0-rc3
Uname: Linux 3.2.0-2-generic i686
ApportVersion: 1.90-0ubuntu1
Architecture: i386
Date: Mon Dec 5 15:46:10 2011
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha i386 (20111114)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: unity-2d
UpgradeStatus: No upgrade log present (probably fresh install)

[James Hunt (jamesodhunt)]

The expected behaviour appears to have regressed as of precise: now, the launcher now shows the default/broken icon symbol too.