Detect new available names in bus

[Lawrence D'Oliveiro]

On Fri, 18 Feb 2022 11:08:16 +0000, Thomas Kluyver wrote:

> We had issues with the Python keyring library that would sometimes
> hang for 10s of seconds while D-Bus tried to launch a keyring/wallet
> service which was getting stuck (I think maybe prompting for a
> password in a way that wasn't visible). We didn't end up checking 'is
> this already running' in that case, but it illustrates why you might
> care about the distinction.

A hang can happen on a bus request for any number of reasons. I’m not
sure why a client of the service needs to care what the reason is. A
hang is a hang.