Issue #19856: shutil.move() failed to move a directory to other directory

on Windows if source name ends with os.altsep.

diff --cc Lib/shutil.py
Simple merge

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

diff --cc Misc/NEWS
index 06223600ac2fe3a6bd97892ce29ef78debad6e40,647cedf34e41e8f933d02adfbc90eecf6a1a0543..5d95b9bf079907f782b563d847699676d02f8dc4
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -37,14 -20,9 +37,17 @@@ Core and Builtin
  Library
  -------
  
+ - Issue #19856: shutil.move() failed to move a directory to other directory
+   on Windows if source name ends with os.altsep.
+ 
 +- Issue #20530: The signatures for slot builtins have been updated
 +  to reflect the fact that they only accept positional-only arguments.
 +
 +- Issue #20517: Functions in the os module that accept two filenames
 +  now register both filenames in the exception on failure.
 +
 +- Issue #20563: The ipaddress module API is now considered stable.
 +
  - Issue #14983: email.generator now always adds a line end after each MIME
    boundary marker, instead of doing so only when there is an epilogue.  This
    fixes an RFC compliance bug and solves an issue with signed MIME parts.