Earth boundary not working in V4

[RSO9192]

In tmap v4 is not possible to reproduce these plots with robinson projections

# working in tmap V3
library(tmap)
data(World)

tm_shape(World, projection = "+proj=robin") +
  tm_polygons("HPI") +
  tm_style("natural", earth.boundary = c(-180, -87, 180, 87))  +
  tm_format("World", inner.margins = 0.02, frame = FALSE)

# tmap v4 not drawing earth boundaries
library(tmap)
data(World)

tm_shape(World, crs = "+proj=robin") +
  tm_polygons("HPI") +
  tm_style("natural", earth.boundary = c(-180, -87, 180, 87))  +
  tm_format("World", inner.margins = 0.02, frame = FALSE)

[Nowosad]

See: #929

[mtennekes]

It's working now, but don't forget to set frame = TRUE.