Default behavior of top left corner infinity mark icon on Linux Mint 12 is following:
Hover or click it with mouse and smart switcher will be displayed.
It is pretty annoying sometimes and I would like to disable hover action behavior.
Answer was found pretty fast here Turn off top left hot corner in Linux Mint 12
1. open file /usr/share/gnome-shell/js/ui/layout.js for edit
$ sudo vi /usr/share/gnome-shell/js/ui/layout.js
2. find lines
this._corner = new Clutter.Rectangle({ name: 'hot-corner', width: 1, height: 1, opacity: 0, reactive: true })
3. change to the following
this._corner = new Clutter.Rectangle({ name: 'hot-corner', width: 1, height: 1, opacity: 0, reactive: false }) //This is changed to false in order to disable hover action.
4.Logoff and logon to your session.
In Mint 13, where they moved from gnome-shell to cinnamon, the configuration file is /usr/share/cinnamon/js/ui/layout.js