XSetClassHint(3) on Linux
The text 3c6651e727d9, as Debian 10 (Buster) shipped it.
allocate class hints structure and set or read a window's WM_CLASS property
The text 3c6651e727d9, as Debian 10 (Buster) shipped it.
allocate class hints structure and set or read a window's WM_CLASS property