Awesome WM: workaround for gnome or mate panel stealing focus

If you use awesome 3.5, and a gnome or mate panel, the panel will often receive focus when you switch desktops. As a workaround:

1. Add this rule to your rc.lua:

   { rule = { class = "Mate-panel" }, properties = { ontop = true, focusable = false } }
   

2. Replace /usr/share/awesome/lib/awful/autofocus.lua with the attached file