Keep IDLE from displaying spurious SystemExit tracebacks
when running scripts that terminated by raising SystemExit
(i.e. unittest and turtledemo).
diff --git a/Misc/NEWS b/Misc/NEWS
index 92bd686..71db196 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -205,6 +205,9 @@
 - Issue #7358: cStringIO.StringIO now supports writing to and reading from
   a stream larger than 2 GiB on 64-bit systems.
 
+- IDLE was displaying spurious SystemExit tracebacks when running scripts
+  that terminated by raising SystemExit (i.e. unittest and turtledemo).
+
 - Issue #10355: In SpooledTemporaryFile class mode and name properties and
   xreadlines method now work for unrolled files.  encoding and newlines
   properties now removed as they have no sense and always produced