[issue26819] _ProactorReadPipeTransport pause_reading()/resume_reading() broken if called before any read is perfored

[miss-islington]

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


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pull_requests: +6656

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue26819>
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