ggdist 3.2.0

New features and enhancements:

• Several computed variables in stat_slabinterval() can now be shared across
  sub-geometries:
  • The .width and level computed variables can now be used in slab / dots
    sub-geometries. These values correspond to the smallest interval computed
    in the interval sub-geometry containing that portion of the slab. This
    gives a more flexible alternative to using cut_cdf_qi() to create densities
    filled according to a set of intervals (this approach which also works on
    highest-density intervals, which cut_cdf_qi() does not). Examples in
    vignette("slabinterval") have been updated to use the new approach, and
    an example has been added to vignette("dotsinterval") showing how to
    color dots by intervals.
  • As an experimental feature (currently a bit fragile) enabled via
    options(ggdist.experimental.slab_data_in_intervals = TRUE),
    the pdf and cdf computed variables can now be used in interval
    sub-geometries to get the PDF and CDF at the point summary. pdf_min,
    pdf_max, cdf_min, and cdf_max also give the PDF and CDF at the lower
    and upper ends of the interval. An example in vignette("lineribbon")
    shows how to use this to make lineribbon gradients whose color approximates
    density (as opposed to the classic gradient fan chart examples already
    in that vignette, where color approximates the CDF).
• scale_thickness_shared() is now provided to allow the thickness scale to be
  shared across geometries, making certain plot types easier to create
  (e.g. plots of prior and posterior densities together). See
  vignette("slabinterval") for an example.
• If thickness is less than 0 it is normalized to have a minimum of zero when
  normalization is turned on; this makes it easier to use slab functions that
  go below zero. A new example in vignette("slabinterval") shows how to use
  this to create raindrop plots.
• The stacking order of dots within bins for geom_dotsinterval(layout = "bin")
  can now be set using the order aesthetic. This makes it possible to create
  "stacked" dotplots by mapping a discrete variable onto the order aesthetic
  (#132). As part of this change, bin_dots() now maintains the original data
  order within bins when layout = "bin". See an example in
  vignette("dotsinterval").
• A new verbose = TRUE flag in geom_dotsinterval() outputs the selected
  binwidth in both data units and normalized parent coordinates. This may be
  useful if you want to start with an automatically-selected bin width and then
  adjust it manually. Though note: if you just want to scale the selected
  bin width to fit within a desired area, it is probably better to use scale,
  and if you want to provide constraints on the bin width, you can pass a
  2-vector to binwidth.
• The expand argument in stat_slabinterval() can now take a length-two logical
  vector to control expansion to the lower and upper limits respectively (#129).
  Thanks to @teunbrand.
• geom_dotsinterval() now supports the family aesthetic for setting the font
  used to display its dots (based on a conversation with @gdbassett).
• Experimental guide_rampbar() for creating gradient-like legends for
  continuous color/fill ramp scales, based on ggplot2::guide_colorbar().
  See an example in vignette("lineribbon").

Bug fixes:

• If there are NAs in the thickness aesthetic of a slab, these are now
  rendered as gaps in the slab (#129).
• Fixed the check for empty x/y scales to avoid extending the scale to cover 0/1
  when plotting distributional objects whose bulk lies outside that region
  (when there is nothing else on the plot).