Detect new available names in bus

[Lawrence D'Oliveiro]

On Tue, 15 Feb 2022 00:51:55 +0100, Sergio Costas wrote:

> The problem is to detect when it is available and change the enabled 
> options in the menu. Of course I can check the availability every
> time I show the menu, but it can be slow, so I wanted an event-based
> alternative.

Or a refresh button.