When View/Hide read threads is checked and some QuickSearch is activated the status of the check is lost: appears unchecked if you open the View menu again (but it's in fact enabled, as only threads with unread mails appear in the Summary View). If you try to uncheck the (apparently unchecked) option in the menu (in my case with the intention of temporarily disable it to view all results) it becomes weirder: the option is effectively disabled and the Summary View updated, but then is quickly enabled again and Summary View flickers back to the initial shorter list. The menu option remains unchecked, though. This can be repeated again ad nauseam :) The only "workaround" is to disable Hide read threads before activating QuickSearch, but then you cannot hide read threads (it does a similar flickering when you check it).
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 2014-06-03 18:57:02.809596232 +0200 http://git.claws-mail.org/?p=claws.git;a=commitdiff;h=e2ef53fd166bd0ce468587ca25df096364ccd24f Merge: 05de74e f9985ae Author: Colin Leroy <colin@colino.net> Date: Tue Jun 3 18:57:02 2014 +0200 Merge branch 'master' of file:///home/git/claws http://git.claws-mail.org/?p=claws.git;a=commitdiff;h=f9985ae65ffaad270013e2ecb618e4556a4411e3 Author: Paul <paul@claws-mail.org> Date: Tue Jun 3 17:56:15 2014 +0100 fix bug 3170, 'QuickSearch fights with View/Hide read threads menu option'