readline and bash disagree on $'' quoting

[Daniel Colascione]

Consider this command:

  foo $'foo \' bar'

As far as the bash core is concerned, this command has one argument
word. But readline, for completion, splits it up into three words:

  0: foo
  1: $'abc \'
  2: bar'

Shouldn't we be splitting the command line into the same number of words?

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