Comment 36 for bug 39328

This proof-of-concept patch registers a boolean option at /apps/panel/global/tasklist_mousewheel, in which a true setting turns on the mousewheel capability and the false option turns it off. There is not yet a "gconf schema" for it and I am not sure if the gconf option was added in the right place, but nevertheless it demonstrates the option requested in this bug.

A few caveats:

1) it should probably be a per-panel option, stored in /apps/panel/applets/window_list_screenX/prefs where X is the number of the screen upon which the window tasklist is shown. That would make it consistent with the other panel options;
2) there needs to be a GUI option added to the gnome-panel preferences applet to toggle the flag;
3) as mentioned earlier, it needs a default value and a gconf schema and I don't know exactly what the schema is;
4) make sure that the implementation is optimal. Right now, the tasklist constructor (tasklist.c) is returning a global variable of the tasklist GTK object, because I don't know what called the tasklist constructor. The tasklist GTK object needs to be stored because the signal needs to be connected and disconnected upon callback of the gconf notification;
5) ensure that the dependency gconf-2.0 (libgconf2-dev) was added correctly to configure.in, control.in, and anything else that may need it. I don't know the minimal version of the package to specify: I assume any gconf-2.0 will work so this is how the dependency was added for the time being. And I know it's required for Build-Depends, but I don't know if it needs to be in the Depends for the generated libwnck-dev package as it currently is.

Please see libwnck under my PPA to test it for Karmic Koala: https://launchpad.net/~xt-knight/+archive/ppa

You do not need to relink gnome-panel against it. Simply install the deb packages for libwnck and run "killall gnome-panel && gnome-panel". Then add the boolean gconf key. Changes should take effect immediately.