add Rectangle::size_request() which returns actual rectangle size, not bounding box

libs/canvas/canvas/rectangle.h

@@ -90,6 +90,8 @@ public:
 	void set_outline_what (What);
 	void set_outline_all () { set_outline_what (ArdourCanvas::Rectangle::ALL); }
 
+	void size_request (double& w, double& h) const;
+
   private:
 	/** Our rectangle; note that x0 may not always be less than x1
 	 *  and likewise with y0 and y1.

libs/canvas/item.cc

@@ -614,6 +614,8 @@ Item::size_request (double& w, double& h) const
 {
 	Rect r (bounding_box());
 
+	std::cerr << "\titem " << this << " bbox " << r << std::endl;
+
 	w = std::max (requested_width, r.width());
 	h = std::max (requested_height, r.height());
 }

libs/canvas/rectangle.cc

@@ -161,6 +161,13 @@ Rectangle::render (Rect const & area, Cairo::RefPtr<Cairo::Context> context) con
 	render_children (area, context);
 }
 
+void
+Rectangle::size_request (double& w, double& h) const
+{
+	w = _rect.width();
+	h = _rect.height();
+}
+
 void
 Rectangle::compute_bounding_box () const
 {