dunst: improve lockscreen notifications

dunst/dunstrc

@@ -255,3 +255,8 @@
 #	urgency = normal
 #
 # vim: ft=cfg
+
+[locking]
+    appname = "lockscreen"
+    new_icon = "system-lock-screen"
+    history_ignore = yes

i3/lockscreen.sh

@@ -42,6 +42,8 @@ lock(){
 
 notification(){
 	notify-send \
+	  -a lockscreen \
+	  -c lock-warn \
 	  -u critical \
 	  -t 5000 \
 	  -i screensaver \