[issue21624] Idle: Improve htests

[Terry J. Reedy]

Terry J. Reedy added the comment:


New changeset 2000150c569941584994ec4ec59171961209bec3 by terryjreedy in branch 'master':
bpo-21624: IDLE -- minor htest fixes (#2575)
https://github.com/python/cpython/commit/2000150c569941584994ec4ec59171961209bec3


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