[3.12] gh-78889: Stop IDLE Shell freezes from sys.stdout.shell.xyz (GH-121876) (...

[3.12] gh-78889: Stop IDLE Shell freezes from sys.stdout.shell.xyz (GH-121876) (#121912)

gh-78889: Stop IDLE Shell freezes from sys.stdout.shell.xyz (GH-121876)

Problem occurred when attribute xyz could not be pickled.
Since this is not trivial to selectively fix, block all
attributes (other than 'width').  IDLE does not access them
and they are private implementation details.
(cherry picked from commit 58753f33e47fe48906883dc010771f68c13b7e52)

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>