Fix bug where message list columns could be in wrong order after column dra...

Aleksander Machniak

2016-05-20 e48f8945b32ab5b67f1cdeb53a37d3d196e31e4d

 program/lib/Roundcube/rcube_cache_shared.php

@@ -237,6 +237,9 @@
        }

        $this->write_index();

        // reset internal cache index, thanks to this we can force index reload
        $this->index = null;
    }