Issue #15318: Prevent writing to sys.stdin.
Patch by Roger Serwy and myself.
diff --git a/Lib/idlelib/NEWS.txt b/Lib/idlelib/NEWS.txt
index b23b2a7..ed9e105 100644
--- a/Lib/idlelib/NEWS.txt
+++ b/Lib/idlelib/NEWS.txt
@@ -1,6 +1,8 @@
 What's New in IDLE 3.2.4?
 =========================
 
+- Issue #15318: Prevent writing to sys.stdin.
+
 - Issue #13532, #15319: Check that arguments to sys.stdout.write are strings.
 
 - Issue # 12510: Attempt to get certain tool tips no longer crashes IDLE.