fix mono pan automation updates

git-svn-id: svn://localhost/ardour2/branches/3.0@13725 d708f5d6-7413-0410-9779-e7cbd77b26cf

diff --git a/gtk2_ardour/panner_ui.cc b/gtk2_ardour/panner_ui.cc
index 433b5b0c0258685b48393301eedc36a82335d174..181664bb4ec0db1f360b16fe5713d8a9fd3edf87 100644 (file)
--- a/gtk2_ardour/panner_ui.cc
+++ b/gtk2_ardour/panner_ui.cc
@@ -112,6 +112,9 @@ PannerUI::set_panner (boost::shared_ptr<PannerShell> ps, boost::shared_ptr<Panne
         delete _stereo_panner;
         _stereo_panner = 0;
 
+        delete _mono_panner;
+        _mono_panner = 0;
+
        if (!_panner) {
                return;
        }
@@ -419,6 +422,8 @@ PannerUI::effective_pan_display ()
 {
         if (_stereo_panner) {
                 _stereo_panner->queue_draw ();
+        } else if (_mono_panner) {
+                _mono_panner->queue_draw ();
         } else if (twod_panner) {
                 twod_panner->queue_draw ();
         }