bpo-33204: IDLE - revise and extend colorizer test. (GH-6347)


Followup to primary PR for the issue, GH-6344.
(cherry picked from commit 55966f3a0d5f1bf823bd22ce1abbde267b06552f)

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