Issue #12856: Ensure child processes do not inherit the parent's random seed for...

Patch by Brian Harring.

diff --cc Lib/tempfile.py
Simple merge

diff --cc Lib/test/test_tempfile.py
Simple merge

diff --cc Misc/NEWS
index c0d64f41cbab39e0b43525de868a2ef249845488,fba2c3d7d98401499fedc4f7c84c52761aaf3efa..11f3de2ae86a71aa799dc23a1ea843dec2e72edf
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -395,9 -83,10 +395,13 @@@ Core and Builtin
  Library
  -------
  
+ - Issue #12856: Ensure child processes do not inherit the parent's random
+   seed for filename generation in the tempfile module.  Patch by Brian
+   Harring.
+ 
 +- Issue #9957: SpooledTemporaryFile.truncate() now accepts an optional size
 +  parameter, as other file-like objects.  Patch by Ryan Kelly.
 +
  - Issue #13458: Fix a memory leak in the ssl module when decoding a
    certificate with a subjectAltName.  Patch by Robert Xiao.