Checks whether the this can be used with the given source.
The default implementation checks whether the source has an
SourceAuthentication extension and when its method matches get_name
, then it automatically returns true. Contrary, when the source contains GNOME Online Accounts or Ubuntu
Online Accounts extension, then it returns false.
The default implementation is tried always as the first and when it fails, then the descendant's implementation is called.
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Whether the this can be used for the given |