qtile/picom: fix bar rounded corner issue

for some reason, the picom needs to start after the bar is already
there, so added a bit of a delay on startup and restart picom (also delayed) along with
qtile

.config/qtile/autostart.sh

@@ -7,7 +7,7 @@
 /usr/bin/numlockx
 
 # Start compositor
-picom --experimental-backends &
+(sleep 1 && picom --experimental-backends) &
 
 # Start notification server
 dunst &

.config/qtile/config.py

@@ -395,6 +395,10 @@ def autostart():
     autostart_script = os.path.expanduser("~/.config/qtile/autostart.sh")
     subprocess.call([autostart_script])
 
+@hook.subscribe.restart
+def restart_hook():
+    os.system(os.path.expanduser("~/.config/qtile/on_restart.sh"))
+
 
 @hook.subscribe.client_new
 def try_swallow(window):

.config/qtile/on_restart.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+
+# Restart picom so qtile bar does not get round corners
+killall picom ; sleep 1 && picom --experimental-backends &