HUD: seems to trigger operations more than once

Bug Description

When the current application is gnome-terminal hitting ALT to get HUD and then typing 'new tab' gets you the option of a new tab. Selecting this option in HUD gives me 2-3 new tabs in the application.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity 5.6.0-0ubuntu4
ProcVersionSignature: Ubuntu 3.2.0-19.30-generic 3.2.11
Uname: Linux 3.2.0-19-generic x86_64
ApportVersion: 1.94.1-0ubuntu2
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,place,snap,imgpng,regex,mousepoll,move,resize,vpswitch,grid,gnomecompat,session,animation,wall,expo,fade,workarounds,ezoom,scale,unityshell]
Date: Tue Mar 20 18:46:11 2012
EcryptfsInUse: Yes
ProcEnviron:
TERM=xterm
PATH=(custom, user)
LANG=en_GB.UTF-8
SHELL=/bin/bash
SourcePackage: unity
UpgradeStatus: Upgraded to precise on 2012年02月01日 (47 days ago)

I've experienced the same problem with opening new tabs in Chrome.

I am able to reproduce this behaviour with <ALT>[wait]new tab[wait]<ret> in chromium-browser and firefox where I get 2 tabs reproducibly. With a gnome-terminal I get three lots of the paste buffer from <ALT>[wait]paste[wait]<ret>.

This bug was fixed in the package unity - 5.8.0-0ubuntu1

---------------
unity (5.8.0-0ubuntu1) precise-proposed; urgency=low

* New upstream release.
- New "push mouse offscreen" feature really difficult to get (LP: #923749)
- unity-2d-panel crashed with SIGSEGV in
unity::indicator::DBusIndicators::Impl::RequestSyncAll() (LP: #864737)
- Pressing "Alt+Enter" causes compiz to crash in CompOption::value() from
unity::UnityScreen::showLauncherKeyTerminate (LP: #960957)
- SEGSIGV after unplugging external monitor (LP: #962693)
- Background colorization should use a different heuristic (LP: #865239)
- compiz+unity3d generates > 50 wakeups a second on idle system
(LP: #917210)
- [FFe, UIFe] HUD - The HUD does not respect launcher autohide or icon
size settings (LP: #921506)
- clicking on folders in the file lens does not open nautilus
(LP: #921665)
- No text inside multirange filters (LP: #927710)
- can't alt-tab restore minimized uis which have an instance on another
workspace (LP: #933397)
- Ubuntu Software Center Unity launcher integration is not working
(LP: #932280)
- The line separator between the launcher and the dash is cleared when
selecting a category (LP: #941082)
- unity-panel-service crashed with SIGSEGV in g_hash_table_foreach()
(LP: #937119)
- Alt-F10 locks up Unity (LP: #948522)
- multimonitor, launcher: Provide an option to display either a single
launcher or a launcher on each display in a multi-monitor environment
(LP: #950136)
- multimonitor: Please give me a way to turn off sticky monitor edges
(LP: #946104)
- Unity 5.6: key bindings (such as Super) don't work on empty workspace or
on slow/loaded systems (LP: #953089)
- Alt+arrows keyboard shortcuts don't invoke Back and Forward navigation
(LP: #953783)
- HUD is sending 2 menu signals instead of 1 (LP: #956878)
- 6th item of HUD not fully visible (LP: #957229)
- HUD: seems to trigger operations more than once (LP: #960503)
- Launcher gets always desaturated when using HUD on secondary monitor
(LP: #961169)
- [5.8 pre staging] launcher is displayed on the left screen, not the
primary one (LP: #961281)
- launcher icons do not re-saturate after dash is closed (LP: #961844)
- Launcher shows arrows for applications on all workspaces (LP: #961977)
- Dash - Implement overlay scrollbars in Dash (LP: #608124)
- [UIFe] Dash - No message displayed when no results are returned in the
Dash (LP: #711199)
- Dash - "See more..." line should be base-aligned with section header
(LP: #748101)
- Dash - Missing category separator line in dash (LP: #850984)
- Dash and Launcher - As soon as a user starts dragging a file from the
Dash, there is a 'flicker' before the Launcher icons that are valid drop
receptacles re-saturate (LP: #863230)
- Dash - When multiple results have equal string match relevancy ranking,
those with equal ranking should be then sorted by frequency of use.
(LP: #871900)
- Keyboard shortcut - F10 shortcut is used to show m...