If a single header is more than 200 characters long a set of 'off by
one' errors cause memory corruption.
When allocating memory with:
a = malloc (len);
the last usable byte of the memory is 'a + len - 1' rather than 'a +
len'.
Fix the same bug when calculating the current offset should the buffer
used for collecting the output header need to be reallocated.
When headers contain non-ASCII characters, they are encoded according
to rfc2047. Nomtuch reply command emits the headers in the encoded
form, which makes them hard to read by humans who compose the reply.
For example instead of "Subject: Re: Rozlučka" one currently sees
"Subject: Re: =?iso-8859-2?q?Rozlu=E8ka?=".
This patch adds a new GMime filter which is used to decode headers to
UTF-8 and uses this filter when notmuch reply outputs headers.
Signed-off-by: Michal Sojka <sojkam1@fel.cvut.cz>
