Notable Changes

Use immutable.Seq: for Scala 3 and 2.13, the result type of Node.child / Node.nonEmptyChildren / Node.attribute is changed from collection.Seq to immutable.Seq (https://github.com/scala/scala-xml/pull/760)

• Scala 2.13 changed the default scala.Seq alias to immutable.Seq, but the scala-xml library continued to use collection.Seq. This often results in .toSeq conversions when using scala-xml in Scala 3 or 2.13.
• scala-xml was always immutable in spirit, NodeSeq extends immutable.Seq
• A related change to the Scala compiler is under review to encode XML literals as Vector[Node]

Other Changes

• Fix code point for darr entity (https://github.com/scala/scala-xml/pull/729)
• NodeBuffer.&+ returns this.type (https://github.com/scala/scala-xml/pull/744)

Full Changelog: https://github.com/scala/scala-xml/compare/v2.3.0...v2.4.0