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This object abstracts GraphUpdated, and is now the recommended method
to receive notifications upon changes in Tracker data. After creation,
the caller may connect to the ::events signal. This signal packs all
events received in one go, so as to avoid signal emission overhead on
mass changes.
The TrackerNotifier behavior can be slightly modified through the
flags passed during instantiation. Eg. it can be requested to query
some data (urn, location) upfront, although the API is tracker:id centric
otherwise.
https://bugzilla.gnome.org/show_bug.cgi?id=773028
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