Improvable interaction between notify-osd and compiz's expo

[pablomme]

Steps to reproduce (in both natty and oneiric):
- Change the sound volume/brightness of a laptop in order to get a notify-osd bubble, or alternatively install http://apt.ubuntu.com/p/libnotify-bin and issue the command "notify-send x" to the same effect
- Enter expo mode shortly after triggering the notification

The notification will be displayed on all desktops with a size at which any text would not be readable (see attached screenshot). Additionally, if one mouses over a notification other than that in the top-right desktop, it does not disappear (see same screenshot). And, if one mouses over the area where the original full-size notification was, *all* notifications disappear (see second screenshot).

The above issues can be resolved in one of two ways:
- Hide all notifications when in expo mode, possibly delaying those started during expo to display them on exiting
- Overlay notifications on top of expo, responding to mousing over the same area as they do now

The second would seem the simplest and most sensible solution.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: unity 4.16.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.0.0-11.18-generic 3.0.4
Uname: Linux 3.0.0-11-generic x86_64
ApportVersion: 1.23-0ubuntu1
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,imgjpeg,copytex,compiztoolbox,decor,resize,resizeinfo,scale,move,imgpng,put,text,grid,shift,annotate,commands,regex,mousepoll,wall,gnomecompat,place,scaleaddon,animation,workarounds,session,expo,ezoom,unityshell]
Date: Mon Sep 26 00:29:21 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: unity
UpgradeStatus: Upgraded to oneiric on 2011-09-24 (1 days ago)