only update GhostEvents on visible trackviews.

	- this requires that MidiGhostRegion::update_contents_height()
	  also controls visibility.

1 files changed, 12 insertions, 8 deletions

diff --git a/gtk2_ardour/ghostregion.cc b/gtk2_ardour/ghostregion.cc
index 1da70631f7..d9b267cfd7 100644
--- a/gtk2_ardour/ghostregion.cc
+++ b/gtk2_ardour/ghostregion.cc
@@ -305,14 +305,18 @@ MidiGhostRegion::update_contents_height ()
 		uint8_t const note_num = (*it).second->event->note()->note();
 
 		double const y = note_y(trackview, mv, note_num);
-
-		if ((_tmp_rect = dynamic_cast<ArdourCanvas::Rectangle*>((*it).second->item))) {
-			_tmp_rect->set (ArdourCanvas::Rect (_tmp_rect->x0(), y, _tmp_rect->x1(), y + h));
-		} else if ((_tmp_poly = dynamic_cast<ArdourCanvas::Polygon*>((*it).second->item))) {
-			Duple position = _tmp_poly->position();
-			position.y = y;
-			_tmp_poly->set_position(position);
-			_tmp_poly->set(Hit::points(h));
+		if (note_num < mv->lowest_note() || note_num > mv->highest_note()) {
+			(*it).second->item->hide();
+		} else {
+			if ((_tmp_rect = dynamic_cast<ArdourCanvas::Rectangle*>((*it).second->item))) {
+				_tmp_rect->set (ArdourCanvas::Rect (_tmp_rect->x0(), y, _tmp_rect->x1(), y + h));
+			} else if ((_tmp_poly = dynamic_cast<ArdourCanvas::Polygon*>((*it).second->item))) {
+				Duple position = _tmp_poly->position();
+				position.y = y;
+				_tmp_poly->set_position(position);
+				_tmp_poly->set(Hit::points(h));
+			}
+			(*it).second->item->show();
 		}
 	}
 }