When refreshing folder list (or adding new account) for a mail account run by dovecot IMAP server that is using mbox storage engine claws-mail ends up in an infinite loop. Assume I have the following folder hierarchy: $namespace $namespace folder $namespace folder folder1a $namespace folder folder1b $namespace folder folder1c and namespace is #mbox. with "." as separator. The resulting IMAPv4 session is: mb1 LIST "" "#mbox.%" * LIST (\Noselect \HasChildren) "." "#mbox.folder" mb1 OK List completed. mb2 LIST "" "#mbox.folder.%" * LIST (\Noselect \HasChildren) "." "#mbox.folder." * LIST (\NoInferiors \UnMarked) "." "#mbox.folder.folder1a" * LIST (\NoInferiors \UnMarked) "." "#mbox.folder.folder1b" * LIST (\NoInferiors \UnMarked) "." "#mbox.folder.folder1c" mb2 OK List completed. mb3 LIST "" "#mbox.folder.%" * LIST (\Noselect \HasChildren) "." "#mbox.folder." * LIST (\NoInferiors \UnMarked) "." "#mbox.folder.folder1a" * LIST (\NoInferiors \UnMarked) "." "#mbox.folder.folder1b" * LIST (\NoInferiors \UnMarked) "." "#mbox.folder.folder1c" mb2 OK List completed. ... (repeating the same list until claws-mail crashes) A maildir based mailbox does not show the same affect as the listed folder does not appear in listing with trailing separator. Apparently UW-IMAP does the same of listing listed folder with trailing separator.
Important note for hunting the bug, this infinite looping does not happen if the IMAP server is configured to use a '/' as separator (looping reproduced with '.' and '|' separator characters).
Created attachment 1540 [details] fixes the bug. yay!
Changes related to this bug have been committed. Please check latest Git and update the bug accordingly. You can also get the patch from: http://git.claws-mail.org/ ++ ChangeLog 2015-07-15 20:24:02.957898402 +0200 http://git.claws-mail.org/?p=claws.git;a=commitdiff;h=7f5adb6afe761e5b891b6a63eba5d7806e61467e Merge: ae01a13 eee39d7 Author: Colin Leroy <colin@colino.net> Date: Wed Jul 15 20:24:02 2015 +0200 Merge branch 'master' of file:///home/git/claws http://git.claws-mail.org/?p=claws.git;a=commitdiff;h=eee39d758fa409d1c5ebce06228184023f0b86b5 Author: Paul <paul@claws-mail.org> Date: Wed Jul 15 19:23:05 2015 +0100 fix bug 2435, ' Infinite loop+crash when refreshing folders from dovecot mbox based mailbox' Patch by Oliver Schneider