Try to fix Ubi, per previous API changes.

opencog/visualization/ubigraph/Ubigrapher.cc

@@ -96,7 +96,7 @@ void Ubigrapher::watchSignals()
             c_add = space.atomSpaceAsync->addAtomSignal(
                     boost::bind(&Ubigrapher::handleAddSignal, this, _1, _2));
             c_remove = space.atomSpaceAsync->removeAtomSignal(
-                    boost::bind(&Ubigrapher::handleRemoveSignal, this, _1, _2));
+                    boost::bind(&Ubigrapher::atomRemoveSignal, this, _1, _2));
             assert(c_add.connected() && c_remove.connected());
             listening = true;
         } else {
@@ -171,12 +171,11 @@ bool Ubigrapher::handleAddSignal(AtomSpaceImpl* as, Handle h)
     }
 }
 
-bool Ubigrapher::handleRemoveSignal(AtomSpaceImpl* as, Handle h)
+bool Ubigrapher::handleRemoveSignal(AtomSpaceImpl* as, AtomPtr a)
 {
     // XXX This is an error waiting to happen. Signals handling adds must be
     // thread safe as they are called from the AtomSpace event loop
     if (!isConnected()) return false;
-    AtomPtr a = as->cloneAtom(h);
     usleep(pushDelay);
     if (classserver().isA(a->getType(),NODE))
         return removeVertex(h);
@@ -186,11 +185,10 @@ bool Ubigrapher::handleRemoveSignal(AtomSpaceImpl* as, Handle h)
             LinkPtr l(LinkCast(a));
             if (l && l->getOutgoingSet().size() == 2 &&
                      as->getIncoming(h).size() == 0)
-                return removeEdges(h);
+                return removeEdges(a->getHandle());
         }
-        return removeVertex(h);
+        return removeVertex(a->getHandle());
     }
-
 }
 
 void Ubigrapher::updateSizeOfHandle(Handle h, property_t p, float multiplier, float baseline)

opencog/visualization/ubigraph/Ubigrapher.h

@@ -70,8 +70,8 @@ class Ubigrapher
      */
     bool removeEdges(Handle h);
 
-    bool handleAddSignal(AtomSpaceImpl* as, Handle h); //! Signal handler for atom adds.
-    bool handleRemoveSignal(AtomSpaceImpl* as, Handle h); //! Signal handler for atom removals.
+    bool handleAddSignal(AtomSpaceImpl*, Handle); //! Signal handler for atom adds.
+    bool atomRemoveSignal(AtomSpaceImpl*, AtomPtr); //! Signal handler for atom removals.
 
     bool listening; //! Whether the Ubigrapher is listening for AtomSpace signals.
     boost::signals::connection c_add; //! Connection to add atom signals