bpo-33962: Use ttk spinbox for IDLE indent space config (GH-22954)

If ttk.Spinbox is not available (Tk < 8.5.9) use readonly ttk.Combobox.

Co-authored-by: Terry Jan Reedy <tjreedy@udel.edu>
(cherry picked from commit 42d5a4fc3b35e45cdd237d56a04e98894d0a31f5)

Co-authored-by: Mark Roseman <mark@markroseman.com>

Miss Islington (bot) committed 4y ago

540ebc4a8874f94152980be7778f3f793b65f111

Parent: 7496486

Committed by GitHub <noreply@github.com> on 6/10/2021, 8:16:38 PM