[issue21477] Idle: improve idle_test.htest

[Roundup Robot]

Roundup Robot added the comment:

New changeset 334b6725b2f7 by Terry Jan Reedy in branch '2.7':
Issue #21477: Update htest docstring and remove extraneous differences between
http://hg.python.org/cpython/rev/334b6725b2f7

New changeset e56c3585ea80 by Terry Jan Reedy in branch '3.4':
Issue #21477: Update htest docstring and remove extraneous differences between
http://hg.python.org/cpython/rev/e56c3585ea80

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