Bug#406258: more info in upstream
According to upstream ( http://bugs.kde.org/show_bug.cgi?id=114163 ),
> The "bug" is a result of the user explicitly using "Rebuild cache", which
> warns you that this might result in data loss. That, in combination with a
> misuse of F5 as opposed to Ctrl+l
If this is so, then this is only an "usability bug", and the severity should
be downgraded from "important". If this is not the case, it would probably
help to add some info in the upstream bug.