Avoid unnecessary redraw when duplicating.

Region.C

@@ -95,7 +95,8 @@ Region::init ( void )
 Region::Region ( const Region & rhs )
 {
     _offset    = rhs._offset;
-    _track     = rhs._track;
+//    _track     = rhs._track;
+    _track     = NULL;
     _clip      = rhs._clip;
     _start     = rhs._start;
     _end       = rhs._end;

Track.C

@@ -117,8 +117,9 @@ Track::add ( Track_Widget *r )
 
     if ( r->track() )
     {
+        r->redraw();
         r->track()->remove( r );
-        r->track()->redraw();
+//        r->track()->redraw();
     }
 
     r->track( this );