Freeze with specific evaluation in the modeline

[Nicolas P. Rougier (inria)]

I've tried the following code (with Emacs -q, v30.0.60):

(setq mode-line-format
       '(:eval (if (window-in-direction 'down) "yes" "no")))

and it somehow freezes Emacs even though menubar is still responsive and
I can quit through the menu. I'm not sure how to debug since I cannot
really interact anymore.

Could anyone confirms the behavior?

Nicolas

-- 
Nicolas P. Rougier —— www.labri.fr/perso/nrougier
Institute of Neurodegenerative Diseases, Bordeaux