Issue 13296: Fix IDLE to clear compile __future__ flags on shell restart.

(Patch by Roger Serwy)

diff --cc Misc/NEWS
index 381ceae8f4b6d7392ae1ac8ffa79ccb6c838597c,13e79b2a242d7b09315553850a25710b635e9178..67bb6e6049c88ffd028e3a4c3d1f05556267ac26
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -347,9 -66,9 +347,12 @@@ Core and Builtin
  Library
  -------
  
+ - Issue 13296: Fix IDLE to clear compile __future__ flags on shell restart.
+   (Patch by Roger Serwy)
+ 
 +- Fix the xmlrpc.client user agent to return something similar to
 +  urllib.request user agent: "Python-xmlrpc/3.3".
 +
  - Issue #13293: Better error message when trying to marshal bytes using
    xmlrpc.client.