The state handling in add_and_activate_cb() and connect_device_cb() is
redundant to connected_state_cb() and in fact executed only if the
activation is really really really quick (which it never is).
Also, the return_text those implementations provide is different from
what connected_state_cb(), potentially confusing the users and adding
extra work for translators.
Not to mention extra lines of code, reading whose wastes our precious
time on the planet we could spend doing heroin instead.
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