size parameter not working

[carterprince]

Describe the bug
The size parameter in plot_usmap does not affect the output as expected.

To Reproduce
Run this script with the attached Excel file (poverty.xlsx):

library(usmap)
library(ggplot2)
library(readxl)

county_data <- read_excel("poverty.xlsx")

plot_usmap(data = county_data, values = "povrate", size = 0.01) +
  scale_fill_continuous(low = "white", high = "red", name = "Poverty rate (%)")

Observe the output:

The county borders are thick.

Expected behavior
The resulting PDF should have very thin county borders.

Environment (please complete the following information):

• Platform: Fedora Linux
• version output:

> version
              _                           
platform       x86_64-redhat-linux-gnu     
arch           x86_64                      
os             linux-gnu                   
system         x86_64, linux-gnu           
status                                     
major          4                           
minor          3.2                         
year           2023                        
month          10                          
day            31                          
svn rev        85441                       
language       R                           
version.string R version 4.3.2 (2023-10-31)
nickname       Eye Holes                   

• sessionInfo() output:

> sessionInfo()
R version 4.3.2 (2023-10-31)
Platform: x86_64-redhat-linux-gnu (64-bit)
Running under: Fedora Linux 39 (Workstation Edition)

Matrix products: default
BLAS/LAPACK: FlexiBLAS OPENBLAS-OPENMP;  LAPACK version 3.11.0

locale:
[1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C              
[3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8    
[5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8   
[7] LC_PAPER=en_US.UTF-8       LC_NAME=C                 
[9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

time zone: America/New_York
tzcode source: system (glibc)

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] readxl_1.4.3  ggplot2_3.4.4 usmap_0.7.0  

loaded via a namespace (and not attached):
[1] vctrs_0.6.5        cli_3.6.2          rlang_1.1.3        usmapdata_0.2.1   
[5] KernSmooth_2.23-22 DBI_1.2.2          generics_0.1.3     sf_1.0-15         
[9] labeling_0.4.3     glue_1.7.0         colorspace_2.1-0   e1071_1.7-14      
[13] scales_1.3.0       fansi_1.0.6        grid_4.3.2         cellranger_1.1.0  
[17] classInt_0.4-10    munsell_0.5.0      tibble_3.2.1       lifecycle_1.0.4   
[21] compiler_4.3.2     dplyr_1.1.4        Rcpp_1.0.12        pkgconfig_2.0.3   
[25] farver_2.1.1       R6_2.5.1           class_7.3-22       tidyselect_1.2.0  
[29] utf8_1.2.4         pillar_1.9.0       magrittr_2.0.3     proxy_0.4-27      
[33] tools_4.3.2        withr_3.0.0        gtable_0.3.4       units_0.8-5       

Additional context
This worked a while ago, I'm pretty sure I'm doing it the same way.

[pdil]

As of ggplot2 v3.4.0 size has been replaced with linewidth for sizing the width of lines: https://www.tidyverse.org/blog/2022/11/ggplot2-3-4-0/#hello-linewidth

Therefore if you replace size = 0.01 with linewidth = 0.01 it should work.

I do have the documentation still referring to size though so I will update that.