Bug report: Too many messages fetched at once with maxage

[Philipp Kern]

Hi there,

syncing large folders fails for me with offlineimap, at least with maxage=365
in my offlineimaprc.  It seems the query returns too many values for the
active messages on busy mailing list folders and the subsequent fetch isn't
split into multiple parts.

Here's the backtrace:

 WARNING: ERROR in syncfolder for thrall folder debian.lists.release: Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/offlineimap/accounts.py", line 347, in syncfolder
    remotefolder.cachemessagelist()
  File "/usr/lib/pymodules/python2.6/offlineimap/folder/IMAP.py", line 191, in cachemessagelist
    response = imapobj.fetch(messagesToFetch, '(FLAGS UID)')[1]
  File "/usr/lib/pymodules/python2.6/offlineimap/imaplib2.py", line 692, in fetch
    return self._simple_command(name, message_set, message_parts, **kw)
  File "/usr/lib/pymodules/python2.6/offlineimap/imaplib2.py", line 1492, in _simple_command
    return self._command_complete(self._command(name, *args), kw)
  File "/usr/lib/pymodules/python2.6/offlineimap/imaplib2.py", line 1272, in _command_complete
    raise self.error('%s command error: %s %s. Data: %.100s' % (rqb.name, typ, dat, rqb.data))
error: FETCH command error: BAD ['Error in IMAP command FETCH: Too long argument.']. Data: EMOK193 FETCH 6112,6113,6114,6115,6116,6117,6118,6119,6120,6121,6122,6123,6124,6125,6126,6127,6128,6

I guess cachemessagelist in folder/IMAP.py should split the long string, which
is 65823 characters long, into parts and do multiple fetches.  It seems that
the results could just be appended to the response list then?

Kind regards and thanks
Philipp Kern
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