On Tue, 24 Oct 2006, Michael Schaap wrote:
Here's what Thunderbird does for an MBX mailbox:
15 list "" "Mail/foo/*"
15 OK LIST completed
16 close
16 OK No messages deleted, so no update needed
17 delete "Mail/foo"
17 OK DELETE completed
Presumably, the reason why it did command tag 15 was to see if Mail/foo
had any inferiors. But if it had listed Mail/foo, it would have see that
it has the \NoInferiors attribute and thus can not have any inferiors.
while this is what it does for a MIX mailbox:
15 list "" "Mail/foo/*"
* LIST () "/" Mail/foo/
15 OK LIST completed
16 delete "Mail/foo/"
16 NO Can't lock mailbox for delete: Mail/foo/
My guess is that Thunderbird interprets "Mail/foo/" as a sub-mailbox of
"Mail/foo", and therefore thinks it needs to delete it before deleting
"Mail/foo".
That's a misinterpretation on Thunderbird's part. The trailing hierarchy
delimiter simply means that it could have inferiors.
I assume this is a Thunderbird bug, but wouldn't it be cleaner if imapd
didn't return the trailing '/' in the first place? I realize that "Mail/foo"
doesn't actually match "Mail/foo/*"...
You just gave the reason why the trailing delimiter is there; it matches
the pattern and the form without the trailing delimiter does not.
But is "Mail/foo/*" actually expected
to include "Mail/foo" itself?
"Mail/foo/*" doesn't include "Mail/foo", but it does include "Mail/foo/".
If "Mail/foo/" was not included, then there would be no way to distinguish
the case of "Mail/foo exists but has no inferiors" from "Mail/foo does not
exist".
I forget the details; but someone, once upon a time, cared very much about
having that distinction because the code goes to extra effort to do it.
Undoubtably, if I changed it after all these years, I get be flamed to a
crisp. No thanks.
Note that that form is mentioned in the IMAP CREATE command.
It sure looks like Thunderbird does not expect
it...
Since there is nothing in the IMAP specification that precludes it,
Thunderbird needs to be able to handle it.
-- Mark --
http://staff.washington.edu/mrc
Science does not emerge from voting, party politics, or public debate.
Si vis pacem, para bellum.
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