Unicode characters in data frames are not shown as-is in Environment pane

A similar issue for character vectors (https://github.com/rstudio/rstudio/issues/6877) was fixed in https://github.com/rstudio/rstudio/pull/7370, but this still occurs for data frames.

d = data.frame(xi='ξ')


Try reopening source document with UTF encoding

Screenshot from 2020-10-01 16-34-22

The document was saved as UTF-8, but there was no difference. This is on Windows 10.

> sessionInfo()
R version 4.0.2 (2020-06-22)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 19041)

Matrix products: default

[1] LC_COLLATE=English_United States.1252  LC_CTYPE=English_United States.1252    LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C                           LC_TIME=English_United States.1252    

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

loaded via a namespace (and not attached):
[1] compiler_4.0.2   rsconnect_0.8.16 generics_0.0.2   tools_4.0.2      yaml_2.2.1       Rcpp_1.0.5       lubridate_1.7.9

Someone else appears to have also encountered Unicode displaying differently on Windows/Mac systems: Rstudio Windows Ancient Greek Unicode diacritics in tibble display .

My screenshot above is on Ubuntu 20.04. Here is Catalina 10.15.7. Can't test on Win

Screen Shot 2020-10-01 at 5.42.29 PM

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