[3.13] gh-127655: Ensure _SelectorSocketTransport.writelines
pauses the protocol if needed (GH-127656)
#127663
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Ensure
_SelectorSocketTransport.writelines
pauses the protocol if it reaches the high water mark as needed.(cherry picked from commit e991ac8)
Co-authored-by: J. Nick Koston nick@koston.org
Co-authored-by: Kumar Aditya kumaraditya@python.org
_SelectorSocketTransport.writelines
is missing a flow control check allowing writes to fill memory until exhausted #127655