update available panners when panshell changes

Fixes issue when adding splitting plugin

diff --git a/gtk2_ardour/mixer_strip.cc b/gtk2_ardour/mixer_strip.cc
index 830d2bf161bcf4934d70978a6d5ee4b90c0d9f8c..db5287f0d0dd0ab203b5d2dfa7d0ff87cfcb1e40 100644 (file)
--- a/gtk2_ardour/mixer_strip.cc
+++ b/gtk2_ardour/mixer_strip.cc
@@ -1033,6 +1033,7 @@ MixerStrip::connect_to_pan ()
        if (panners._panner == 0) {
                panners.panshell_changed ();
        }
+       update_panner_choices();
 }
 
 void