After updating RStudio IDE to RStudio 2022.12.0+353 "Elsbeth Geranium" for Windows when I write an instruction in the source pane with color names the color name word is highlighted.
plot(1, col = "red") # the word "red" is on a red background plot(1, col = "blue") # the word "blue" is on a blue background
I know I shouldn't post screen shots of code but the actual code is above, this is a post of a screen shot of what the RStudio IDE is displaying.
Here is the full version string copied from the Help > About RStudio menu
RStudio 2022.12.0+353 "Elsbeth Geranium" Release (7d165dcfc1b6d300eb247738db2c7076234f6ef0, 2022-12-03) for Windows
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) RStudio/2022.12.0+353 Chrome/102.0.5005.167 Electron/19.1.3 Safari/537.36