Directories in launcher stuck in highlighted state

[Steve Magoun]

Dragging a tab from a window over the launcher causes directories in the launcher to be highlighted. The launcher does not reset the highlighting when you release the mouse. The result is that the launcher is stuck in a highlighted state. You have to open the dash to make it redraw properly.

To reproduce:
1) Open a terminal (Ctrl-Alt-T)
2) Open a second tab in the terminal (Ctrl-Shift-T)
3) Drag one of the tabs from the terminal over the launcher
4) Release the mouse button

Expected results
The terminal tab is opened in a new window. The Launcher looks the way it did before step 1.

Actual results:
During step 3, all directories in the launcher get highlighted as if they are drop targets for the tab. After step 4 the terminal tab is opened in a new window but the directories in the launcher remain highlighted.

See the attached screen recording for an example. In the video, I add a step between 3+4 in which I return the terminal tab to its window. I did this to make it more obvious when the mouse button was released (it's when the terminal tab reappears in the original window). This step is not required.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: unity 6.12.0daily13.02.08-0ubuntu1
ProcVersionSignature: Ubuntu 3.8.0-6.11-generic 3.8.0-rc7
Uname: Linux 3.8.0-6-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.8-0ubuntu4
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
Date: Fri Feb 15 09:17:24 2013
InstallationDate: Installed on 2010-09-17 (882 days ago)
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Beta amd64 (20100901.1)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: unity
UpgradeStatus: Upgraded to raring on 2013-01-25 (20 days ago)

[Launchpad Janitor (janitor)]

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