That's right, any time QNAM is used it uses the Qt Bearer backend
(unless Qt is configure without bearer). In the case of the network-
manager backend, it calls the blocking dbus calls to get list of
services, and then for every service to get that services properties.
Even for local file:// access, even though the bearer is not even used
for local file access, thanks to QNAM private c'tor.

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https://bugs.launchpad.net/bugs/1480877

Title:
  Access points' "PropertiesChanged" dbus signals freeze UI on mobile
  devices

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