Set the attributes of this item.
The attributes
are a mapping of string keys to string values. Attributes are used to search for items. Attributes are not
stored or transferred securely by the secret service.
This function may block indefinitely. Use the asynchronous version in user interface threads.
this |
an item |
schema |
the schema for the attributes |
attributes |
a new set of attributes |
cancellable |
optional cancellation object |
whether the change was successful or not |