EMail list has a hidden email between page 1 and page 2

[netchild]

My message list is sorted descending, and in list view mode. Page 1 has all emails unread. Page 2 has all emails read. If I go to the last message on page 1 (the one on the bottom of the list) and delete it, a new unread message shows up as the last entry in the list on page 1, which was not listed on page 2 before the deletion of the email on page 1.

Example:

Before delete:

• "A" = email 1 (unread)
• ...
• "H" last email on page 1 (unread)
• "J" first email on page 2 (read)
• "K" second email on page 2 (read)
• "L" 3rd email on page 2 (read)

After delete of "H":

• "A" = email 1 (unread)
• ...
• "I" last email on page 1 (unread, not listed before)
• "K" first email on page 2 (read)
• "L" second email on page 2 (read)

• After delete of "I":

• "A" = email 1 (unread)
• ...
• "J" last email on page 1 (read)
• L" first email on page 2 (read)

[alecpl]

It does not make sense. What Roundcube version? What plugins? What sorting column? How many messages in the folder? How many on one page?

[netchild]

Roundcube 1.6.6, no sorting order (right now... I was expecting sorted by receive-date, not sure when I changed that), right now with about 120 messages (read+unread) in the folder I can not reproduce, sometimes I have more than 400 unread messages in the folder (source commit notifications), so maybe more than 500 in total, and there I noticed it. 50 messages on one page.

I agree that it doesn't make sense, but when I wrote the bugreport, I was able to validate that behavior with multiple messages. I noticed it a while before, but didn't bother to make a bugreport. Recently I noticed it again, and I decided to report the bug. To make sure I really see that behavior, I tested this behavior several times by looking at the last mail in the first page and the first mail of the second page, and I validated 3 times that this was the behavior I was seeing. Right now I do not have that much messages in this folder, and I can not reproduce by deleting a message.

How is the sort order handled, does it depend on the IMAP server, or is it sorted locally by looking at all messages? I switched recently from the default imap_cache and default session_cache to a redis based cache. Can this have an influence on the outcome?

Extensions: extension	version	license	--
additional_message_headers	1.2.1	GPL-3,0+
archive	3.5	GPL-3,0+
attachment_reminder	1.1	GPL-3,0+
carddav	v5.1.0	GPL-2,0
contextmenu	3.3.1	GPL-3,0+
debug_logger	1.0	GPL-3,0+
emoticons	3.0	GPL-3,0+
enigma	0.9	GPL-3,0+
filesystem_attachments	1.0	GPL-3,0+
gravatar		GPL-3,0+
help	1.4	GPL-3,0+
hide_blockquote	1.0	GPL-3,0+
html5_notifier		GPL-3,0+
identity_select	1.1	GPL-3,0+
jqueryui	1.13.2	GPL-3,0+
login_info	1.5.1	GPL-3,0+
markasjunk	2.0	GPL-3,0+
new_user_dialog	2.4	GPL-3,0+
newmail_notifier	0.8	GPL-3,0+
roundcube_caldav		GPL-3,0+
subscriptions_option	1.4	GPL-3,0+
tls_icon		MIT
userinfo	1.2	GPL-3,0+
vcard_attachments	4.2	GPL-3,0+
zipdownload	3.4	GPL-3,0+