add API to make sure that region cue markers are above any waveviews or MIDI etc

gtk2_ardour/audio_region_view.cc

@@ -1334,6 +1334,8 @@ AudioRegionView::create_one_wave (uint32_t which, bool /*direct*/)
 	/* channel wave created, don't hook into peaks ready anymore */
 	delete _data_ready_connections[which];
 	_data_ready_connections[which] = 0;
+
+	maybe_raise_cue_markers ();
 }
 
 void

gtk2_ardour/region_view.cc

@@ -1196,3 +1196,11 @@ RegionView::set_selected (bool yn)
 	_region->set_selected_for_solo(yn);
 	TimeAxisViewItem::set_selected(yn);
 }
+
+void
+RegionView::maybe_raise_cue_markers ()
+{
+	for (ViewCueMarkers::iterator v = _cue_markers.begin(); v != _cue_markers.end(); ++v) {
+		(*v)->view_marker->the_item().raise_to_top ();
+	}
+}

gtk2_ardour/region_view.h

@@ -167,6 +167,8 @@ protected:
 	virtual void color_handler () {}
 	virtual void parameter_changed (std::string const&);
 
+	void maybe_raise_cue_markers ();
+
 	boost::shared_ptr<ARDOUR::Region> _region;
 
 	ArdourCanvas::Polygon* sync_mark; ///< polgyon for sync position