Difference between and with $pipe_decode

[Kevin J. McCarthy]

Ticket #183 <https://gitlab.com/muttmua/mutt/issues/183> notes that when piping a message with $pipe_decode set, mime headers such as content-type and content-transfer-encoding are passed through as-is.

Thank you!

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Kevin J. McCarthy
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This can confuse programs that look at those headers, since they are no longer correct. I haven't dug through the twisty maze of _mutt_copy_message() flags very much. I do note that set_copy_flags() sets different flags than pipe_set_flags() for the decode case. Specifically (CH_MIME | CH_TXTPLAIN). I'm wondering if anyone on the list can supply context for the difference between pipe decode and copy decode, before I experiment with adding those two flags for piping too.

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