SI-8475 Fix off by one in GroupedIterator when Streaming

This also affected sliding and grouped since they defer to GroupedIterator

1 files changed, 3 insertions, 1 deletions

diff --git a/src/library/scala/collection/Iterator.scala b/src/library/scala/collection/Iterator.scala
index 1b496383a3..e321a6adba 100644
--- a/src/library/scala/collection/Iterator.scala
+++ b/src/library/scala/collection/Iterator.scala
@@ -926,7 +926,9 @@ trait Iterator[+A] extends TraversableOnce[A] {
     private def takeDestructively(size: Int): Seq[A] = {
       val buf = new ArrayBuffer[A]
       var i = 0
-      while (self.hasNext && i < size) {
+      // The order of terms in the following condition is important
+      // here as self.hasNext could be blocking
+      while (i < size && self.hasNext) {
         buf += self.next
         i += 1
       }