handle chunked input that splits \r\n
#3066
Merged
+46
−1
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Save a trailing \r for the next stream even in order to avoid a newline marker being split by a chunk boundary.
This requires an adjustment of the test
test_decoder_data_start_with_different_newline_positionsintests/sansio/test_multipart.py. The difficult bit is relative to where the state machine of the parsing ends up while parsing invalid input. The only thing that happens is that the very first event is one byte smaller, and that is by design.fixes #3065.