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Separating out the implementation of the handshake when starting a long-running subprocess (for example, as is done for a clean/smudge filter) was done in commit fa64a2fd ("sub-process: refactor handshake to common function", 2017-07-26), but its documentation still resides in gitattributes. Split out the documentation as well. Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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