Messaging Menu updated with only-on-demand appearance behavior (Ubuntu 12.10)

Weeks ago, Quantal Quetzal received a refreshed Messaging Menu, featuring specific names for contained entries (such as Gwibber, Thunderbird Mail, etc), as well as specific icons and redesigned Empathy status icons (emblems/status labels), bundle of changes taking the Messaging Menu a step further towards a more clean clear intuitive experience.

The mentioned changes have been implemented (and landed in Ubuntu 12.10 by default) as part of a months-old official plan (targeting and successfully applying numerous changes to indicators), plan that, along with visual changes and refinements, has been focused on adding behavior changes (to pair/complete the UI improvements).

The latest updates introduce a new behavior for Ubuntu 12.10's Messaging Menu, meaning, displaying it (Indicator Messages) only if there are applications requiring it.

Consequently, installing a fresh Ubuntu 12.10, presents the user a Unity panel lacking an envelope icon (that houses the Messaging Menu), yet, after the user adds a new (Twitter, etc) account via System Settings-->Online Accounts, the envelope is summoned and displayed on the Unity panel.

Furthermore, Messaging Menu's functionality is now application-based, adding a Twitter account (manageable via Gwibber), displays the envelope on the panel, yet featuring only the Gwibber entry and fully ignoring other entries (such as Empathy, Thunderbird, etc).

The first impression is that the mentioned indicator is both used screen-space optimized and (more important) deals with and exposes only used applications, allowing users to accurately observe (and thus maneuver, adjust, etc) the at-that-moment utilized applications.

As a "side effect", the recently landed Unity Gwibber lens is hidden by default, yet, adding a Twitter account, exposes the Gwibber lens on the lens bar (and populates its view with messages, links, etc), a natural behavior (for a user not utilizing a social account, the Gwibber lens has zero functionalities) that properly removes both inconsistencies (the Gwibber lens being the only lens without exposed items and search results) and potential false alarms (not seeing search results on the Gwibber lens, users may think that there are various issues/bugs affecting the lens).