Keyboard-generated right click no longer works.

Playing with a single-click trackpad, a right-click must be generated by holding down a key (control) while clicking. However, as of the last few snapshots this has become impossible because the game fails to register keyboard-created right-clicks, which were recognized in previous versions of the game.

What I expected to happen was...:
When holding control and clicking on my trackpad I expected a right-click to register.

What actually happened was...:
A standard left-click registered instead.

Steps to Reproduce:
1. Load a world, either creative or survival in the latest snapshots.
2. Attempt to make a right-click using a trackpad and holding down control.
3. The result will be a standard left-click instead of the desired result.