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Discrete labels from break names #6148

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Discrete labels from break names #6148

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teunbrand
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This PR aims to fix #6147 and fix #6089.

Briefly, names(breaks) is used as default label for discrete breaks.
We also use this mechanism to populate discrete secondary labels (#6089).

Reprex from #6147 with a secondary axis:

devtools::load_all("~/packages/ggplot2/")
#> ℹ Loading ggplot2

ggplot(mpg, aes(drv, hwy)) +
  geom_boxplot() +
  scale_y_continuous(
    breaks = c(twenty = 20, thirty = 30, fourty = 40)
  ) +
  scale_x_discrete(
    breaks = c("four-wheel" = 4, forward = "f", reverse = "r"),
    sec.axis = dup_axis()
  )

Created on 2024-10-18 with reprex v2.1.1

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