* src/tgbaalgos/emptiness_stats.hh (ec_statistics::depth): New function.

* src/tgbaalgos/gtec/gtec.cc (couvreur99_check_shy::clear_todo,
couvreur99_check_shy::check): Count all successors in the
todo stack rather than all items on the stack.

src/tgbaalgos/emptiness_stats.hh

@@ -60,17 +60,17 @@ namespace spot
     }
 
     void
-    inc_depth()
+    inc_depth(int n = 1)
     {
-      ++depth_;
+      depth_ += n;
       if (depth_ > max_depth_)
 	max_depth_ = depth_;
     }
 
     void
-    dec_depth()
+    dec_depth(int n = 1)
     {
-      --depth_;
+      depth_ -= n;
     }
 
     int
@@ -91,6 +91,12 @@ namespace spot
       return max_depth_;
     }
 
+    int
+    depth() const
+    {
+      return depth_;
+    }
+
   private :
     unsigned states_;		/// number of disctint visited states
     unsigned transitions_;	/// number of visited transitions