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Use the newly added g_settings_schema_list_keys() API instead of g_settings_list_keys() in order to list keys. Doing this allows the 'list-keys' command to work without creating a GSettings object, which is more efficient. It also means that we don't have to provide a (meaningless and ignored) path when listing keys on relocatable schemas. While we're at it, update the 'range' command not to require creation of a GSettings object, in a similar way. https://bugzilla.gnome.org/show_bug.cgi?id=740308
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