Unable to add text annotation to geom_sf plot

[sschloss1]

I would like to use relative positioning (0-1 scale) to add a text annotation to a ggplot object that uses geom_sf. I've tried two different methods that were mentioned here, but both seem to fail with different results.

First attempt, using Hadley's suggestion does produce any annotation:

library(ggplot2)
ggplot(nc, aes(fill=AREA)) + 
  geom_sf() + 
  annotate("text", -Inf, Inf, label = "Top-left", hjust = 0, vjust = 1)

I never see "Top-left" on the plot no matter what values I've tried for hjust or vjust.

Second attempt, using textGrob (via this comment):

library(sf)
library(ggplot2)
library(grid)
nc = st_read(system.file("shape/nc.shp", package="sf"))
ggplot(nc) +geom_sf(aes(fill = AREA))+
	annotation_custom(textGrob(label="xx"))

This results in "Error in grid.Call.graphics(C_setviewport, vp, TRUE): non-finite location and/or size for viewport". I get the same results if I specify x and y locations in textGrob with different units (npc, cm, lines).

Any help would be most welcome. Thanks.

(This was originally posted to the sf repo but was posted here at the suggestion of yutannihilation who said "I guess coord_sf() forgets to squash Inf within the range, which coord_cartesian() does.")

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