SI-8932 Fix dropRight/takeRight implementations

I looked up at all the overrides of `IterableLike#takeRight` and
`IterableLike#dropRight` and replaced usages of its argument `n` with
`math.max(n, 0)` every time it was being used in an index subtraction.

Fixes [SI-8932](https://issues.scala-lang.org/browse/SI-8932).

1 files changed, 2 insertions, 2 deletions

diff --git a/src/library/scala/collection/IndexedSeqOptimized.scala b/src/library/scala/collection/IndexedSeqOptimized.scala
index 42cb37aa24..a7e06b4d1a 100755
--- a/src/library/scala/collection/IndexedSeqOptimized.scala
+++ b/src/library/scala/collection/IndexedSeqOptimized.scala
@@ -141,10 +141,10 @@ trait IndexedSeqOptimized[+A, +Repr] extends Any with IndexedSeqLike[A, Repr] {
   def drop(n: Int): Repr = slice(n, length)
 
   override /*IterableLike*/
-  def takeRight(n: Int): Repr = slice(length - n, length)
+  def takeRight(n: Int): Repr = slice(length - math.max(n, 0), length)
 
   override /*IterableLike*/
-  def dropRight(n: Int): Repr = slice(0, length - n)
+  def dropRight(n: Int): Repr = slice(0, length - math.max(n, 0))
 
   override /*TraversableLike*/
   def splitAt(n: Int): (Repr, Repr) = (take(n), drop(n))