Forwarded from http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=195425

 Do this: Go -> Bookmarks [0] -> select a topic, hold control down,
 select another topic.  The second topic is selected and the first one
 is deselected.  Perhaps my GTK-fu is rusty but I was 99% sure that
 holding control down would allow me to select several entries in a
 list.  I was expecting to see a list of entries filed under both topics
 (just the intersection of all the selected sets -- union does not make
 sense, why would wish to have the union of several topics?).  I
 remember the feature was there.  Did I dream it up?  I couldn't find a
 reference in the changelog.

(bug filed on 0.6.1 but still the case in 0.7.0)