Apply fix from #4357 to agg_path_storage

deps/agg/include/agg_path_storage.h

@@ -981,11 +981,12 @@ namespace agg
             {
                 join_path(a);
             }
-            else
+            // We are adding an explicit line_to, even if we've already add the
-            {
+            // bezier arc to the current path. This is to prevent subsequent smooth
+            // bezier curves from accidentally assuming that the previous command
+            // was a bezier curve as well when calculating reflection points.
             line_to(x, y);
         }
-        }
         else
         {
             move_to(x, y);