"The issue is that when three tap is performed on a touchpad, a middle button click may be emitted.
...
disabling three-touch tap to click by default is the best option. Users who want the functionality are still free to enable it themselves using the xinput utility
...
The Unity action on a three-touch tap would be to show the resize ("love") handles."
Thank you for your bug report, the context of this change is in https:/ /lists. ubuntu. com/archives/ ubuntu- desktop/ 2012-February/ 003694. html
"The issue is that when three tap is performed on a touchpad, a middle button click may be emitted.
...
disabling three-touch tap to click by default is the best option. Users who want the functionality are still free to enable it themselves using the xinput utility
...
The Unity action on a three-touch tap would be to show the resize ("love") handles."