[issue18592] Idle: test SearchDialogBase.py

[Terry J. Reedy]

Terry J. Reedy added the comment:

The warning was due to absence of def self.root. Attached is close to what will commit.

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stage: needs patch -> commit review
Added file: http://bugs.python.org/file35784/test-search-sdb-18592-34.diff

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<http://bugs.python.org/issue18592>
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