1585 brought up the point that the login form (when allowing outside users to register) hops from the username field to the "register" link on pressing TAB.  

The ticket asked that the following procedure be possible:

1. Entering username
2. Pressing TAB
3. Entering password
4. Pressing ENTER

This patch allows this.

Manual, in Firefox 3.0.19 and Chrome 5.0.375.28 dev.