Patterns in geom_sf() (#5717)

* Use `fill_alpha()` instead of `alpha()`

* add news bullet

Author: teunbrand

NEWS.md

@@ -6,6 +6,8 @@
 * Facet evaluation is better at dealing with inherited errors 
   (@teunbrand, #5670).
 * Fixed spurious warnings from `sec_axis()` with `breaks = NULL` (#5713).
+* Patterns and gradients are now also enabled in `geom_sf()` 
+  (@teunbrand, #5716).
 
 # ggplot2 3.5.0
 

R/geom-sf.R

@@ -202,7 +202,7 @@ sf_grob <- function(x, lineend = "butt", linejoin = "round", linemitre = 10,
   col <- x$colour %||% defaults$colour[type_ind]
   col[is_point | is_line] <- alpha(col[is_point | is_line], alpha[is_point | is_line])
   fill <- x$fill %||% defaults$fill[type_ind]
-  fill <- alpha(fill, alpha)
+  fill <- fill_alpha(fill, alpha)
   size <- x$size %||% defaults$size[type_ind]
   linewidth <- x$linewidth %||% defaults$linewidth[type_ind]
   point_size <- ifelse(