The webbrowser module now uses subprocess's start_new_session=True rather

than a potentially risky preexec_fn=os.setsid call.

diff --cc Misc/NEWS
index f9ead1c8a971cb95573c5ea3e7520e718667fc8e,bc9086123fdd6226752b93085bcbf25be743ad94..82f5ba0afeba43f7a641e2548b62c9a870629e7f
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -124,26 -27,12 +124,29 @@@ Core and Builtin
  Library
  -------
  
+ - The webbrowser module now uses subprocess's start_new_session=True rather
+   than a potentially risky preexec_fn=os.setsid call.
+ 
 +- Issue #22042: signal.set_wakeup_fd(fd) now raises an exception if the file
 +  descriptor is in blocking mode.
 +
 +- Issue #16808: inspect.stack() now returns a named tuple instead of a tuple.
 +  Patch by Daniel Shahaf.
 +
  - Issue #22236: Fixed Tkinter images copying operations in NoDefaultRoot mode.
  
 -- Issue #22191: Fix warnings.__all__.
 +- Issue #2527: Add a *globals* argument to timeit functions, in order to
 +  override the globals namespace in which the timed code is executed.
 +  Patch by Ben Roberts.
 +
 +- Issue #22118: Switch urllib.parse to use RFC 3986 semantics for the
 +  resolution of relative URLs, rather than RFCs 1808 and 2396.
 +  Patch by Demian Brecht.
 +
 +- Issue #21549: Added the "members" parameter to TarFile.list().
 +
 +- Issue #19628: Allow compileall recursion depth to be specified with a -r
 +  option.
  
  - Issue #15696: Add a __sizeof__ implementation for mmap objects on Windows.