I use RStudio Desktop on Ubuntu 20.4 installed by 'sudo gdebi rstudio-1.4.1106-amd64.deb'.
When I press any symbol key on keyboard with active console expected symbol does not appeared, but does appeared symbol inputed before. Like: Console clear now when I press 's' key and nothing appeared. But when I press key 'a' it appears symbol 's' pressed before but not 'a'. Then I press other one, for example, 'p' and 'a' appears. After I press 'Enter' it appears all pressed symbols 'sap' and R interpreter recognizes it normally giving me the expected result. Problem is in that I can't write code normally in console due to not seeing all actual text. I guess problem in something like stack shift or alike. For example when I press 'Backspace' at first, it appears last pressed symbol and when I press this key second time, the symbol previously appeared disappears. When I wrote some text and then hold 'Backspace' all symbols erased excepting first one. If I press 'Backspace' again it doesn't disappear, and again press and this last symbol still here. Equal situation with 'Del' key. And when I press left/right arrows it works similar. It really looks like Console shows me previous state, not following.
What I was doing before problem:
I have been using RStudio for about 1-2 weeks. It worked normally. Today I tried to implement readline() analogue which would work both through 'Rscript' command (from terminal to be interpreted) and in interactive mode. I used function interactive() to recognize whether script run in interactive.
I called both readline() and readLines(con='stdin', n=1) from Rstudio console and using 'Rscript' command in terminal to run my script. When I run script via 'Rscript' command with readline function it returned me "" (empty string). My solution was to get function implementing readline() behavior both in interactive and interpreter modes.
It works fine, but after I solved my issue with readline I found mentioned problem. I can't say exactly how to reproduce this problem.
How I tried to fix it:
I write You because I have no view how to explain it correctly and Google-understandably. I was searching for same problems but didn't found nothing similar. And also I tried few times to reinstall RStudio, but I new to Ubuntu and all my RStudio configurations are saved when I uninstall and then install again Rstudio Desktop (After installation I see the same theme as I set). Once I tried to delete all files with word 'rstudio' in name after deinstallation. I wouldn't write You if it worked.