Update mixer strip colours when route active state changes

(#4439).


git-svn-id: svn://localhost/ardour2/branches/3.0@10429 d708f5d6-7413-0410-9779-e7cbd77b26cf

gtk2_ardour/mixer_strip.cc

@@ -2071,3 +2071,9 @@ MixerStrip::add_output_port (DataType t)
 {
 	_route->output()->add_port ("", this, t);
 }
+
+void
+MixerStrip::route_active_changed ()
+{
+	reset_strip_style ();
+}

gtk2_ardour/mixer_strip.h

@@ -121,6 +121,7 @@ class MixerStrip : public RouteUI, public Gtk::EventBox
 	std::string state_id() const;
 
 	void parameter_changed (std::string);
+	void route_active_changed ();
 
   protected:
 	friend class Mixer_UI;