[3.10] bpo-45495: Add 'case' and 'match' to IDLE completions list. (GH-29000) (GH-29001)



Since the keyword list is frozen, only compute it once per
session.  The colorizer already handles context keywords.
(cherry picked from commit 42ac06dcd234bdda989dcfe854ac5173337024c9)


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

Automerge-Triggered-By: GH:terryjreedy
3 files changed