Whenever I play with ggplot2, I feel there must be some better way of debugging ggplot2 than desperately
ggplot_build(). For example, I wonder if it is possible to
debug() Geom's or Stat's methods, e.g.
compute_group(). I always try
debug() or building a package with break points, but none of my attempts have succeeded so far...
Does anyone know how to debug ggplot2 effectively?