I have recently moved from MacOS to Pop! OS (an Ubuntu-based distro).
Keyboard is set up as US-INTL with Dead Keys. In all programs, the combo "acute+C" prints CEDILLA (Ç, ç), except for RStudio, which returns ACCUTE-C character (Ć, ć).
Even RStudio's Terminal returns ACCUTE-C instead of CEDILLA, while any terminal application installed in the OS gets it right.
I supposed this is GUI related.
This is driving me crazy as it really hurts when collaborating on RMD notebooks.
Thanks for confirming. It sounds like this issue is unique to the desktop application. You might consider filing an issue at https://github.com/rstudio/rstudio/issues.