Summary:
Ref T13216. See PHI985. When you click a line number to start an inline comment, we intend to initiate the action only if you used the left mouse button (desktop) or a touch (tablet/device).
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.
Test Plan:
- In Safari, Firefox and Chrome:
- Used left click to start an inline.
- Used middle click to do nothing (previously: started an inline).
Reviewers: amckinley
Reviewed By: amckinley
Maniphest Tasks: T13216
Differential Revision: https://secure.phabricator.com/D19836