Backport #22826
Creating a new buffered reader for every part of the blame can miss
lines, as it will read and buffer bytes that the next buffered reader
will not get.
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Signed-off-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: Brecht Van Lommel <brecht@blender.org>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>