phpbb/phpbb3 — pull request #989 by EXreaction (2012-09-04 00:10:44+00:00)
Title: Ticket/8796

Mark forum(s) read (or mark topics read) marks some topics you haven't read
(any posts/topics posted between when the page was loaded and when the user clicked the mark read button was previously marked as read)

http://tracker.phpbb.com/browse/PHPBB3-8796