[BUG] Saving attachments containing UTF-8 chars

[Michael Stapelberg]

Hello,

attached you can find a message which seems to trigger a bug somewhere
in my notmuch setup. The message has been sent to me and includes a
patchfile, which, when saved using the "w" key in notmuch-emacs, cannot
be applied.

When using munpack(1) on the raw mail file (I’ve attached rawmail.gz
just to be sure that the message doesn’t get mangled in some way), the
unpacked attachment can be attached just fine.

When diff'ing both files, I see that munpack correctly stores the file,
including the problematic UTF-8 apostrophe:
00000200  67 3b 20 64 69 64 6e e2  80 99 74 20 72 65 61 64  |g; didn...t read|

However, the version of the file saved with notmuch contains:
00000200  67 3b 20 64 69 64 6e 19  74 20 72 65 61 64 22 20  |g; didn.t read" |

If there is anything I can do to help debugging this (or if there is a
known fix), please let me know.

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