Hi,

Because sieve-edit-script() does not set buffer not-modified when
downloading a sieve script, so, a user including muself cannot
distinguish whether the viewing script is modified or not modified from
the downloaded script on the managesieve server.

If sieve-edit-script() set buffer not-modified when downloading a sieve
script, a user can distinguish its modified status easily.

Therefore, I propose the following patch.

-- 
TSUCHIYA Masatoshi