[issue24746] doctest 'fancy diff' formats incorrectly strip trailing whitespace

[miss-islington]

Change by miss-islington <mariatta.wijaya+miss-islington at gmail.com>:


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pull_requests: +10981, 10982, 10983, 10985
stage: test needed -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue24746>
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