Merge branch 'master' into revert2796

NEWS.md

@@ -1,8 +1,18 @@
 # ggplot2 3.1.1.9000
 
-* `sec_axis()` now places ticks accurately when using nonlinear transformations (@dpseidel, #2978).
+This is a minor release with an emphasis on internal changes to make ggplot2 
+faster and more consistent. The few interface changes will only affect the 
+aesthetics of the plot in minor ways, and will only potentially break code of
+extension developers if they have relied on internals that have been changed. 
+This release also sees the addition of Hiroaki Yutani (@yutannihilation) to the 
+core developer team.
+
+## New features
 
-* `geom_hline()`, `geom_vline()`, and `geom_abline()` now throw a warning if the user supplies both an `xintercept`, `yintercept`, or `slope` value and a mapping (@RichardJActon, #2950).
+* This release includes a range of internal changes that speeds up plot 
+  generation. None of the changes are user facing and will not break any code,
+  but in general ggplot2 should feel much faster. The changes includes, but are
+  not limited to:
 
   - Caching ascent and descent dimensions of text to avoid recalculating it for
     every title.
@@ -13,8 +23,48 @@
   - Removing the plyr dependency, replacing plyr functions with faster 
     equivalents.
 
+* `geom_polygon()` can now draw polygons with holes using the new `subgroup` 
+  aesthetic. This functionality requires R 3.6.0 (@thomasp85, #3128)
+
+* Aesthetic mappings now accept functions that return `NULL` (@yutannihilation,
+  #2997).
+
+* `stat_function()` now accepts rlang/purrr style anonymous functions for the 
+  `fun` parameter (@dkahle, #3159).
+
+* `geom_rug()` gains an "outside" option to allow for moving the rug tassels to 
+  outside the plot area (@njtierney, #3085) and a `length` option to allow for 
+  changing the length of the rug lines (@daniel-wells, #3109). 
+
+## Extensions
+
+* Layers now have a new member function `setup_layer()` which is called at the
+  very beginning of the plot building process and which has access to the 
+  original input data and the plot object being built. This function allows the 
+  creation of custom layers that autogenerate aesthetic mappings based on the 
+  input data or that filter the input data in some form. This is mainly of 
+  interest to extension developers (@clauswilke, #2872).
 
-* `scale_shape_identity()` now works correctly with `guide = "legend"` (@malcolmbarrett, #3029)
+* `x0` and `y0` are now recognized positional aesthetics so they will get scaled 
+  if used in extension geoms and stats (@thomasp85, #3168)
+
+## Minor improvements and bug fixes
+
+* `coord_map()` now can have axes on the top and right (@karawoo, #3042).
+
+* `coord_sf()`, `coord_map()`, and `coord_polar()` now squash `-Inf` and `Inf`
+  into the min and max of the plot (@yutannihilation, #2972).
+
+* `coord_sf()` graticule lines are now drawn in the same thickness as panel grid 
+  lines in `coord_cartesian()`, and seting panel grid lines to `element_blank()` 
+  now also works in `coord_sf()` 
+  (@clauswilke, #2991, #2525).
+
+* `economics` data has been regenerated. This leads to some changes in the
+  values of all columns (especially in `psavert`), but more importantly, strips 
+  the grouping attributes from `economics_long`.
+
+* `element_line()` now fills closed arrows (@yutannihilation, #2924).
 
 * Facet strips on the left side of plots now have clipping turned on, preventing
   text from running out of the strip and borders from looking thicker than for
@@ -57,6 +107,8 @@
 
 * `stat_bin()` will now error when the number of bins exceeds 1e6 to avoid 
   accidentally freezing the user session (@thomasp85).
+
+* `sec_axis()` now places ticks accurately when using nonlinear transformations (@dpseidel, #2978).
 
 * `facet_wrap()` and `facet_grid()` now automatically remove NULL from facet
   specs, and accept empty specs (@yutannihilation, #3070, #2986).