Don't allow the middle mouse button to start an inline comment
We currently have a not right condition for doing this, but it only excludes right clicks, not middle clicks (or other nth-button clicks). The not right condition was sligthly easier to write, but use an is left condition instead of a not right condition.
- In Safari, Firefox and Chrome:
- Used left click to start an inline.
- Used middle click to do nothing (previously: started an inline).
Reviewed By: amckinley
Maniphest Tasks: T13216
Differential Revision: https://secure.phabricator.com/D19836