Use a timer to limit the path finding

surface_vectorial.cpp

@@ -320,9 +320,13 @@ optional<linestring_type_fp> do_milling(
   const double horizontalG0speed = 100;
   const double g0_time = vertical_distance/vertG0speed + max_manhattan/horizontalG0speed + vertical_distance/vertG1speed;
   const double max_g1_distance = g0_time * horizontalG1speed;
-  //path_finding::PathLimiter x = [](const point_type_fp& target, const coordinate_type_fp& length) -> bool { return true; };
+  using namespace std::chrono;
+  auto t1 = system_clock::now();
   path_finding::PathLimiter path_limiter =
       [&](const point_type_fp& waypoint, const coordinate_type_fp& length_so_far) -> bool {
+        if (system_clock::now() - t1 > seconds(1)) {
+          return true;
+        }
         // Return true if this path needs to be clipped.  The distance from
         // a to target so far is length.  At best, we'll have a stright
         // line from there to the goal, b.