#17614: IDLE no longer raises exception when quickly closing a file.

diff --cc Lib/idlelib/PyShell.py
Simple merge

diff --cc Misc/NEWS
index b941ae0317a48c8430ace87f4354ee07598917d5,75141c61062a11c956bb9fa199caf7266e8c06d6..8ffd9dee66bc06e474a9870dc053f9de29ab6212
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -19,6 -12,11 +19,8 @@@ Core and Builtin
  Library
  -------
  
 -- Issue #13163: Rename operands in smtplib.SMTP._get_socket to correct names;
 -  fixes otherwise misleading output in tracebacks and when when debug is on.
 -
+ - Issue #17614: IDLE no longer raises exception when quickly closing a file.
+ 
  - Issue #6698: IDLE now opens just an editor window when configured to do so.
  
  - Issue #8900: Using keyboard shortcuts in IDLE to open a file no longer