

This was my first thought as well. The code doesn’t even have to be very secretive to beat most people from figuring it out. Torture would be the only way and it still would have plausible deniability.
So eventually no decipherable, nor understandable decryption easily succeeds. (The previous sentence has a secret message.)
if
esc
oralt+f4
don’t do what you want, try going to window management in settings and making a window rule. you can click thedetect window properties
button then click the offending window and set the window type to match. then you can try using rules like forcing the titlebar on just that window or ignoring global shortcuts or one called ‘closable’. i’ve never used any of these but it’s a thought.