Clients don't get notifications of updates to the bluetooth.battery card property
While writing release notes, I noticed that the code that updates the
bluetooth.battery card property doesn't send a subscription event to notify clients of the change. We could just slap a
pa_subscription_post() call there and be done with it, but I would like to have a
pa_card_set_property() that logs property changes and handles notifications instead.
We have functions
pa_sink_input_update_proplist() which can be used as templates for implementing the same for cards.
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