NodeSeq attribute search does not work as expected

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When using the back-slash operator on a NodeSeq, the behaviour does not match how XPath works. Getting the attribute value works when there's only a single element in the node sequence:

> val x = <x><a b='1'/></x>
> x \ "a" \ "@b"
res2: scala.xml.NodeSeq = 1

but fails when there are more:

> val x = <x><a b='1'/><a b='2'/></x>
> x \ "a" \ "@b"
res3: scala.xml.NodeSeq = NodeSeq()

expected:

res3: Seq(1, 2)

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Imported From: https://issues.scala-lang.org/browse/SI-9047?orig=1
Reporter: Sunny Kalsi (skalsi)
Affected Versions: 2.10.4

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Joseph Walton (jwalton) said:
I've taken a look at this and opened a PR with tests and a possible fix: SI-9047: Extract attributes from multiple elements.

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@SethTisue said:
The scala-xml library is now community-maintained. Issues with it are now tracked at https://github.com/scala/scala-xml/issues instead of here in the Scala JIRA.

Interested community members: if you consider this issue significant, feel free to open a new issue for it on GitHub, with links in both directions.

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@SethTisue said:
scala/scala-xml#63