Rename Refactoring on private members in Tuple notation

[huitseeker]

In file Test.scala:

class Test {

  private val A, B, C = this
}

Renaming the class to MyTest.scala results in :

class MyTest {

  private val A
  B
  private val A BC = MyTest.this
}

which mangles the original source.

Copy of #1001547