when a playlist is relayered, relayer ghost regions too

gtk2_ardour/midi_time_axis.cc

@@ -1849,3 +1849,4 @@ MidiTimeAxisView::create_velocity_automation_child (Evoral::Parameter const &, b
 
 	add_automation_child (Evoral::Parameter(MidiVelocityAutomation), velocity_track, show);
 }
+

gtk2_ardour/region_view.cc

@@ -657,6 +657,16 @@ RegionView::lower_to_bottom ()
 	_region->lower_to_bottom ();
 }
 
+void
+RegionView::visual_layer_on_top ()
+{
+	get_canvas_group()->raise_to_top ();
+
+	for (auto& ghost : ghosts) {
+		ghost->group->raise_to_top ();
+	}
+}
+
 bool
 RegionView::set_position (timepos_t const & pos, void* /*src*/, double* ignored)
 {

gtk2_ardour/region_view.h

@@ -82,6 +82,7 @@ public:
 
 	void move (double xdelta, double ydelta);
 
+	void visual_layer_on_top();
 	void raise_to_top ();
 	void lower_to_bottom ();
 

gtk2_ardour/streamview.cc

@@ -294,7 +294,7 @@ StreamView::layer_regions()
 
 	// Fix canvas layering by raising each to the top in the sorted order.
 	for (RegionViewList::iterator i = copy.begin(); i != copy.end(); ++i) {
-		(*i)->get_canvas_group()->raise_to_top ();
+		(*i)->visual_layer_on_top ();
 	}
 }
 

gtk2_ardour/streamview.h

@@ -153,7 +153,7 @@ protected:
 
 	void         display_track (std::shared_ptr<ARDOUR::Track>);
 	virtual void undisplay_track ();
-	void         layer_regions ();
+	void layer_regions ();
 
 	void playlist_switched (std::weak_ptr<ARDOUR::Track>);
 

gtk2_ardour/time_axis_view_item.h

@@ -96,10 +96,11 @@ public:
 	virtual void drag_end();
 	bool dragging() const { return _dragging; }
 
-	virtual void raise () { return; }
-	virtual void raise_to_top () { return; }
-	virtual void lower () { return; }
-	virtual void lower_to_bottom () { return; }
+	virtual void visual_layer_on_top() {}
+	virtual void raise () {}
+	virtual void raise_to_top () {}
+	virtual void lower () {}
+	virtual void lower_to_bottom () {}
 
 	/** @return true if the name area should respond to events */
 	bool name_active() const { return name_connected; }