DND from archive fails and locks launcher in DND mode

[Tigran Gabrielyan]

How to reproduce:
1. Open an archive
2. Drag a folder or file to Nautilus launcher

Expected:
File to be extracted.

What happened:
File is not extracted and *after* I let go of the mouse, the launcher remains in DND mode (all icons are dimmed except Nautilus).

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: unity 6.12.0daily13.03.11-0ubuntu1
Uname: Linux 3.9.0-030900rc2-generic x86_64
ApportVersion: 2.9.1-0ubuntu1
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
Date: Tue Mar 12 20:40:42 2013
InstallationDate: Installed on 2013-03-06 (6 days ago)
InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130305)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)