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Bin breaks are chosen awkwardly for stat_density_2d #4004

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@tjebo

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@tjebo

This is a follow up from #4003 - I was asked to open a new issue, which I will do -

by exactly quoting @clauswilke :)

There seems to be a problem where the breaks are chosen awkwardly for stat_density_2d()

See below, reprex with thanks copied from Claus !

library(ggplot2)

ggplot() + 
  geom_contour_filled(data = faithfuld, aes(waiting, eruptions, z = density), bins = 3, alpha = 0.5) +
  stat_density_2d(data = faithful, aes(waiting, eruptions), bins = 3, color = "black", size = 1)

ggplot() + 
  geom_density_2d_filled(data = faithful, aes(waiting, eruptions), bins = 3, alpha = 0.5) +
  geom_density_2d(data = faithful, aes(waiting, eruptions), bins = 3, color = "black", size = 1)

Created on 2020-05-15 by the reprex package (v0.3.0)

Session info
devtools::session_info()
#> ─ Session info ───────────────────────────────────────────────────────────────
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#>  date     2020-05-15                  
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