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Outside decorators, a dotted name is parsed by the grammar as
stmt -> test -> power -> atom trailer -> (NAME) ('.' NAME)
where the first NAME is an 'atom' and the second NAME is a 'trailer'.
Thus, testing if the most recent variable is a 'trailer' and the most
recent node is a '.' is almost always enough for Jedi to properly
complete dotted names.
However, the grammar for decorators is more restricted and doesn't allow
arbitrary atoms and trailers; instead, a dotted name in a decorator is
decorator -> '@' dotted_name -> '@' (NAME '.' NAME),
meaning the most recent variable will be 'dotted_name', not 'trailer'.
Besides in decorators, the 'dotted_name' variable is only used in import
statements which are handled previously in _get_context_completions,
so checking for 'dotted_name' in this arm of the if only covers decorators
and not inadvertently anything else.