This new API has only a couple of users, and I'm quite sure they'll work
fine with your changes.

There's indeed an issue with the change notifications being sent to all
clients (I just filed bug 1603412 about that), and possibly confusing
them -- your patch should help in avoiding ending up in an inconsistent
state.

About the pseudo code I suggested, indeed it's making a signal
connection for each Manager object, but I suspect that given that they
are all targeting the same "service/object path/interface" triplet
they'll be squashed into a single connection in some layer below in the
D-Bus stack, so they won't pose an additional burden on the D-Bus
service.

Please note that, even if we add your patch (which is actually needed for 
solving the notification handling issue), the main -- and I would add, *only* 
-- goal of the library is to support clients represented by *single* 
.application file. Unconfined clients which perform the authentication on 
behalf of a *single* click application also fall into this category, but 
anything more complex than this doesn't.
So, given that your project doesn't fall in this category, you are welcome to 
use the library if it fits your goals, but if it doesn't, I'm not inclined to 
extend the API with functionality that would not be useful for a click 
application.

The reason I'm writing this is that I suspect that online-accounts-api (even 
with your patch applied) is still too limited and not suitable for your goal, 
unless you go for the pseudocode I wrote above: how will you find out the 
service IDs you are interested in?
Normally, they are encoded in the .application file shipped by the app, and 
online-accounts-api internally figures that out; but it doesn't expose any 
methods that would let you know what service types are supported by an 
application.

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https://bugs.launchpad.net/bugs/1602159

Title:
  Manager class only provides access to one (random?) service ID for an
  account

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