BUG: Using pointer that points to a destructed string's content

[David Bremner]

Tamas Szakaly <sghctoma at gmail.com> writes:

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> Dear notmuch developers,
>
> The following line is from _notmuch_message_add_directory_terms in
> lib/message.cc (line 652 in HEAD):
>
> direntry = (*i).c_str ();
>

This should be fixed in commit 3d978a0d

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