Properly handle removal of a track's active sequence.

Timeline/Sequence.C

@@ -78,6 +78,9 @@ Sequence::~Sequence (  )
 
     if ( _widgets.size() )
         FATAL( "programming error: leaf destructor must call Sequence::clear()!" );
+
+    if ( parent() )
+        parent()->remove( this );
 }
 
 

Timeline/Track.C

@@ -490,6 +490,17 @@ Track::remove ( Audio_Sequence *t )
 
     timeline->wrlock();
 
+    if ( sequence() == t )
+    {
+        pack->remove( t );
+
+        if ( takes->children() )
+            sequence( (Audio_Sequence*)takes->child( 0 ) );
+        else
+            /* FIXME: should this ever happen? */
+            _sequence = NULL;
+    }
+    else
         takes->remove( t );
 
 /*     delete t; */