Cannot drag app to launcher if the same app was previously removed

[Chad A Davis]

Binary package hint: unity

if a custom .desktop file launcher is dropped on the panel and then removed from the launcher, adding that launcher again does not show it in the launcher unless unity is restarted.

steps to reproduce:
1. create a launcher on the desktop named 'terminal' and ask it to open gnome-terminal
2. drop it over the launcher.
3. now right click on it and untick 'keep in launcher'
4. now again drag the launcher from the desktop and drop it over the unity launcher see the icon is not shown.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: unity 3.8.2-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-8.41-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
NonfreeKernelModules: nvidia wl
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module 270.30 Fri Feb 25 14:34:55 PST 2011
 GCC version: gcc version 4.5.2 (Ubuntu/Linaro 4.5.2-8ubuntu1)
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,decor,vpswitch,compiztoolbox,regex,snap,imgpng,unitymtgrabhandles,commands,resize,gnomecompat,animation,grid,place,mousepoll,move,expo,wall,workarounds,session,ezoom,staticswitcher,fade,scale,scaleaddon,unityshell]
CompositorRunning: compiz
Date: Wed Apr 6 18:57:19 2011
DistUpgraded: Fresh install
DistroCodename: natty
DistroVariant: ubuntu
DkmsStatus:
 bcmwl, 5.100.82.38+bdcom, 2.6.38-7-generic, x86_64: installed
 bcmwl, 5.100.82.38+bdcom, 2.6.38-8-generic, x86_64: installed
 nvidia-current, 270.30, 2.6.38-8-generic, x86_64: installed
GraphicsCard:
 nVidia Corporation GT216 [GeForce GT 330M] [10de:0a29] (rev a2) (prog-if 00 [VGA controller])
   Subsystem: Apple Computer Inc. Device [106b:00c7]
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64+mac (20110329.1)
InstallationMedia_: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64+mac (20110329.1)
InstallationMedia__: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64+mac (20110329.1)
JockeyStatus:
 kmod:wl - Broadcom STA wireless driver (Proprietary, Enabled, In use) [auto-install]
 xorg:nvidia_current - NVIDIA accelerated graphics driver (Proprietary, Enabled, In use)
MachineType: Apple Inc. MacBookPro6,2
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, user)
 LANG=en_US.utf8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic root=UUID=20914fdb-fb20-42bc-a752-3c6dfcd9a517 ro quiet splash vt.handoff=7
ProcVersionSignature_: Ubuntu 2.6.38-8.41-generic 2.6.38.2
ProcVersionSignature__: Ubuntu 2.6.38-8.41-generic 2.6.38.2
Renderer: Unknown
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)
XorgConf:
 Section "Device"
  Identifier "Default Device"
  Option "NoLogo" "True"
 EndSection
dmi.bios.date: 07/26/10
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MBP61.88Z.0057.B0C.1007261552
dmi.board.asset.tag: Base Board Asset Tag#
dmi.board.name: Mac-F22586C8
dmi.board.vendor: Apple Inc.
dmi.board.version: MacBookPro6,2
dmi.chassis.type: 10
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-F22586C8
dmi.modalias: dmi:bvnAppleInc.:bvrMBP61.88Z.0057.B0C.1007261552:bd07/26/10:svnAppleInc.:pnMacBookPro6,2:pvr1.0:rvnAppleInc.:rnMac-F22586C8:rvrMacBookPro6,2:cvnAppleInc.:ct10:cvrMac-F22586C8:
dmi.product.name: MacBookPro6,2
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.
version.compiz: compiz 1:0.9.4git20110322-0ubuntu5
version.ia32-libs: ia32-libs 20090808ubuntu11
version.libdrm2: libdrm2 2.4.23-1ubuntu6
version.libgl1-mesa-dri: libgl1-mesa-dri 7.10.1-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.1-0ubuntu3
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg: xserver-xorg 1:7.6+4ubuntu3
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu4
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-4ubuntu6
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110107+b795ca6e-0ubuntu6

[Chad A Davis (chadadavis)]

This behavior has also been mentioned in the comments of other bugs:
https://bugs.launchpad.net/ubuntu/+source/nux/+bug/737519/comments/8
https://bugs.launchpad.net/unity/+bug/662616/comments/11

[Chad A Davis (chadadavis)]

And restarting unity (e.g. logging out) allows the given icon to be added to the Launcher again.

[Omer Akram (om26er)]

I have updated the description and I can confirm that I am able to reproduce the bug. This could actually be related to other several issues where icon for running apps is not shown.