Fix ghost zero lines

git-svn-id: svn://localhost/ardour2/trunk@974 d708f5d6-7413-0410-9779-e7cbd77b26cf

diff --git a/gtk2_ardour/audio_region_view.cc b/gtk2_ardour/audio_region_view.cc
index 076473881d9a58046a9c76ed1139d0618daf7b17..9892eb47cc1726211f393d299189dc4ffc783782 100644 (file)
--- a/gtk2_ardour/audio_region_view.cc
+++ b/gtk2_ardour/audio_region_view.cc
@@ -772,6 +772,9 @@ AudioRegionView::create_waves ()
        }
 
        if (create_zero_line) {
+               if (zero_line) {
+                       delete zero_line;
+               }
                zero_line = new ArdourCanvas::SimpleLine (*group);
                zero_line->property_x1() = (gdouble) 1.0;
                zero_line->property_x2() = (gdouble) (_region->length() / samples_per_unit) - 1.0;