End feedback when the client vanished
We should watch DBus names of clients and cancel their feedbacks when they go away (via https://developer.gnome.org/gio/stable/gio-Watching-Bus-Names.html#g-bus-watch-name)
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We should watch DBus names of clients and cancel their feedbacks when they go away (via https://developer.gnome.org/gio/stable/gio-Watching-Bus-Names.html#g-bus-watch-name)