Pass freedesktop hints to naughty.notify (#1875)

lib/naughty/core.lua

@@ -51,6 +51,10 @@ notifications, e.g.
         args.text = 'prefix: ' .. args.text
         return args
     end
+  To reject a notification return `nil` from the callback.
+  If the notification is a freedesktop notification received via DBUS, you can
+  access the freedesktop hints via `args.freedesktop_hints` if any where
+  specified.
 
 @tfield table presets Notification presets.  See `config.presets`.
 

lib/naughty/dbus.lua

@@ -181,6 +181,7 @@ capi.dbus.connect_signal("org.freedesktop.Notifications",
                 if expire and expire > -1 then
                     args.timeout = expire / 1000
                 end
+                args.freedesktop_hints = hints
                 notification = naughty.notify(args)
                 return "u", notification.id
             end