libwnck-3-dev explore install package command doc https://developer.gnome.org/libwnck/stable/ https://developer.gnome.org/glib/stable/glib-The-Main-Event-Loop.html https://lazka.github.io/pgi-docs/index.html#Wnck-3.0 example https://github.com/GNOME/devilspie http://git.savannah.gnu.org/cgit/devilspie2.git