+ for(set<Track *>::iterator i=tracks.begin(); i!=tracks.end(); ++i)
+ {
+ const vector<Track *> &links = (*i)->get_links();
+ for(vector<Track *>::const_iterator j=links.begin(); j!=links.end(); ++j)
+ if(*j && tracks.insert(*j).second)
+ changed = true;
+ }
+
+ if(changed)
+ signal_changed.emit();
+}
+
+void Selection::select_blocks()
+{
+ bool changed = false;
+ for(set<Track *>::iterator i=tracks.begin(); i!=tracks.end(); ++i)