update all marker positions after a tempo map change

gtk2_ardour/editor.h

@@ -789,6 +789,7 @@ private:
 	void ensure_cd_marker_updated (LocationMarkers* lam, ARDOUR::Location* location);
 	void update_cue_marker_display ();
 	void ensure_cue_marker_updated (LocationMarkers* lam, ARDOUR::Location* location);
+	void update_all_marker_lanes ();
 
 	TimeAxisView*      clicked_axisview;
 	RouteTimeAxisView* clicked_routeview;

gtk2_ardour/editor_markers.cc

@@ -336,6 +336,17 @@ struct MarkerComparator {
 	}
 };
 
+void
+Editor::update_all_marker_lanes ()
+{
+	for (auto & lam : location_markers) {
+		lam.second->start->reposition ();
+		if (lam.second->end) {
+			lam.second->end->reposition ();
+		}
+	}
+}
+
 /** Update all marker labels in all groups */
 void
 Editor::update_marker_labels ()

gtk2_ardour/editor_tempodisplay.cc

@@ -343,6 +343,7 @@ Editor::tempo_map_changed ()
 
 	 reset_metric_marks ();
 	 update_tempo_based_rulers ();
+	 update_all_marker_lanes ();
 	 maybe_draw_grid_lines ();
 }
 

gtk2_ardour/marker.h

@@ -91,6 +91,7 @@ public:
 	void set_show_line (bool);
 	void set_line_height (double);
 
+	virtual void reposition ();
 	virtual void set_position (Temporal::timepos_t const &);
 	void set_name (const std::string&, const std::string & tooltip = std::string());
 	void set_color (std::string const& color_name);
@@ -163,7 +164,6 @@ protected:
 
 	int          _cue_index;
 
-	virtual void reposition ();
 	void setup_line_x ();
 	void setup_name_display ();