Clicking on a world once (1 time) opens it.

What I expected to happen was...:
The world to be selected so I could delete it, it had no use any more.

What actually happened was...:
The world opened, not to be selected.

Steps to Reproduce:
1. Create any world then get out.
2. Click once on it.
3. This should have opened the world, while in 14w11a and before, it would have selected it, so you can re-create, delete, edit, ect...

Note: While this bug is random, it annoys me.