Hi Helmut, thank you very much for the patch. I applied it to our collab-maint repo so it will be in the next htop release for testing/Buster.
https://anonscm.debian.org/cgit/collab-maint/htop.git/commit/?id=ba3d665468e9752a81a50bb2df7639950e0a3c77 Kind regards, Daniel