RTL is so much fun, it's the gift that keeps on going, when I first encountered it I thought, ok, maybe some junior web app developers will sometimes forget that it exists and a fun bug or two will get into production, but it's everywhere, Windows, GNU/Linux, automated emails, it can make malware hardware to detect by users in Windows because you can hide the dotexe at the beginning of the filename, etc.

Here it is today in GNOME 46.0, after so many years, this should say "selected": https://github.com/user-attachments/assets/306737fb-6b01-467... In previous GNOME versions it would mess up even more text in the file properties window.

Here's an article about it, but I couldn't find the more interesting blogpost about RTL: https://krebsonsecurity.com/2011/09/right-to-left-override-a...