I set up a search folder as described in http://docs.kde.org/stable/en/kdepim/kmail/folders.html, as the search condition I searched for message tag containing the "To Do" tag (aka "action item"). As expected, the folder shows all messages with the tag set. Upon setting or unsetting the tag for messages, the search folder is not updated though, the search folder is not updated, not even upon restart of Kontact. Reproducible: Always
Bump. Search Folders are not very usefull if there is no way to update the content.
This bug has only been reported for versions before 4.14, which have been unsupported for at least two years now. Can anyone tell if this bug still present? If noone confirms this bug for a Framework-based version of kmail2 (version 5.0 or later, as part of KDE Applications 15.12 or later), it gets closed in about three months.
Just as announced in my last comment, I close this bug. If you encounter it again in a recent version (at least 5.0 aka 15.08), please open a new one unless it already exists. Thank you for all your input.