[issue24759] Idle: require tk 8.5 and ttk widgets, and drop unneeded code.

[Roundup Robot]

Roundup Robot added the comment:

New changeset 81927f86fa3a by Terry Jan Reedy in branch 'default':
Issue #24759: Add test for IDLE syntax colorizoer.
https://hg.python.org/cpython/rev/81927f86fa3a

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24759>
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