I just upgraded RStudio desktop IDE from 1.2.1327 to 1.2.1329 and can no longer select text in (at least) the editor window. Click-drag does not select text. Double-click does not select text. Editing is almost unusable.
The behaviour survived a restart of Rstudio and a reboot of the computer. Other programs were fine.
I reverted to 1.2.1327 and the problem disappeared.
I am running the Ubuntu 18+ versions of Rstudio.
My computer is running Ubuntu 18.04 64-bit.
My apologies for not responding earlier - I have been unavailable all week. I see the issue has been sorted out on GitHub by more skilled people than me.