[issue21477] Idle: improve idle_test.htest

[Terry J. Reedy]

Terry J. Reedy added the comment:

I just discovered today that Rietveld can do diffs between diffs, so to speak. For example, 
http://bugs.python.org/review/21477/diff2/11941:11942/Lib/idlelib/idle_test/htest.py
showed the changes between patched htest in 3.4 and 2.7.

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