Issue #14018: merge

diff --cc Lib/idlelib/NEWS.txt
index 1d87443bd49b289472bf98161a43e75d661691ac,3160c74561d0aafe68482c4a577fa8d61ed96288..a0c957e37316512aafe5c909ba42d1d4b99713c2
--- 1/Lib/idlelib/NEWS.txt
--- 2/Lib/idlelib/NEWS.txt
+++ b/Lib/idlelib/NEWS.txt
@@@ -34,6 -33,6 +34,9 @@@ What's New in IDLE 3.3.0
  - Issue #3573: IDLE hangs when passing invalid command line args
    (directory(ies) instead of file(s)).
  
++- Issue #14018: Update checks for unstable system Tcl/Tk versions on OS X
++  to include versions shipped with OS X 10.7 and 10.8 in addition to 10.6.
++
  
  What's New in IDLE 3.2.1?
  =========================