Error message related to line width

[Robinlovelace]

I think this is a recent regression in v4 and that it works fine in v3.

Reproducible example:

# second intro plot -----------------------------------------------------------
library(tmap)
#> The legacy packages maptools, rgdal, and rgeos, underpinning the sp package,
#> which was just loaded, will retire in October 2023.
#> Please refer to R-spatial evolution reports for details, especially
#> https://r-spatial.org/r/2023/05/15/evolution4.html.
#> It may be desirable to make the sf package available;
#> package maintainers should consider adding sf to Suggests:.
#> The sp package is now running under evolution status 2
#>      (status 2 uses the sf package in place of rgdal)
#> 
#> Attaching package: 'tmap'
#> The following object is masked from 'package:datasets':
#> 
#>     rivers
library(rcartocolor)
library(spDataLarge)
library(terra)
#> terra 1.7.46

# data read ---------------------------------------------------------------
cla_raster = rast(system.file("raster/srtm.tif", package = "spDataLarge"))
cat_raster = rast(system.file("raster/nlcd.tif", package = "spDataLarge"))

# plots create ------------------------------------------------------------
rast_srtm = tm_shape(cla_raster) +
  tm_raster(col.scale = tm_scale_continuous(values = carto_pal(7, "Geyser")),
            col.legend = tm_legend("Elevation (m)")) + 
  tm_title("A. Continuous data") +
  tm_layout(legend.frame = TRUE, 
            legend.bg.color = "white",
            legend.position = c("right", "bottom"))

rast_nlcd = tm_shape(cat_raster) +
  tm_raster(col.scale = tm_scale_categorical(levels.drop = TRUE),
            col.legend = tm_legend("Land cover")) + 
  tm_title("B. Categorical data") +
  tm_layout(legend.frame = TRUE, 
            legend.bg.color = "white",
            legend.position = c("right", "bottom"))

tmap_arrange(rast_srtm, rast_nlcd, nrow = 1)
#> Error in if (width == 0L) width <- digits: missing value where TRUE/FALSE needed

^{Created on 2023-09-07 with reprex v2.0.2}

[Robinlovelace]

This is leading to our CI failing in more than one place so definitely a regression: geocompx/geocompr#984