Don't attempt to process ANSI sequences in non-UTF8 input #1117
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Fixes #677
from_utf8_lossywas being used to convert non-utf8 (e.g. binary) input to utf-8, and we were attempting to process the result as if it were a valid utf-8 string containing ANSI escape sequences. However,from_utf8_lossycan produce output that causes the ANSI parser to panic. An example is\u{fffd}J␊i.e.ef bf bd 4a 0a.