Polish characters don't work in RStudio IDE

[Grzegorz]

Hi,

I have the same problem as described here:

RStudio and foreign letters (diacritic signs)

Hi All, Is it possible to have foreign language (Polish) letters in R-script window in RStudio ? When I want to write them down, I am not able to do it (as usual with right Alt) . When I copy and paste it eg. from office - it works and I have ("łążźóęśććć楥ĄŚŚŚŚŚĆĆÓÓÓŁŁŁŁŻŻŹŹŹ") all of them. Any help would be much appreciated. Thank you in advance.

In the RStudio latest version I can't write polish characters, but not all of them, for example "ż" (right alt + z) is working, but not "ą" (right alt + a). Everything is OK in the R GUI. This problem didn't appear in the previous version of RStudio which I used(1.2.5XXXX). Perhaps it is a problem with shorcuts? For example right alt + x (which is "ź" in Polish) is "Please select the code to extract a function". I would like to highlight that I have this problem in the script, but also in the console, so I think that it is not connected with script encoding. My session info:
R version 4.0.0 (2020-04-24)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 18363)

Matrix products: default

locale:
[1] LC_COLLATE=Polish_Poland.1250 LC_CTYPE=Polish_Poland.1250 LC_MONETARY=Polish_Poland.1250
[4] LC_NUMERIC=C LC_TIME=Polish_Poland.1250

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

loaded via a namespace (and not attached):
[1] compiler_4.0.0 tools_4.0.0

---SOLUTION---

Well, to be honest, I didn't find the solution, but I wrote the issue in RStudio's github:

Some Polish characters don't work in RStudio IDE console or script

and it looks like it is indeed bug in the version 1.3.959. In the version 1.2.5033 everything is OK, so one possible solution is to use previous version of RStudio. Also, on github there is an answer saying that in the version 1.4 (still in development, right?) this problem doesn't exist.