Latest compton/picom has deprecated several settings. Some of those

cause compton to not start.  Cleaned up compton.conf.

compton/compton.conf

@@ -11,16 +11,16 @@ shadow-opacity = .3;
 shadow-ignore-shaped = false;
 shadow-exclude = [
 	"name = 'Notification'",
-# workaround for conky until it provides window properties:
+	# workaround for conky until it provides window properties:
 	"override_redirect = 1 && !WM_CLASS@:s",
-    "class_g ?= 'Dmenu'",
-#	"class_g ?= 'Dunst'",
-# disable shadows for hidden windows:
+	"class_g ?= 'Dmenu'",
+	#"class_g ?= 'Dunst'",
+	# disable shadows for hidden windows:
 	"_NET_WM_STATE@:32a *= '_NET_WM_STATE_HIDDEN'",
 	"_GTK_FRAME_EXTENTS@:c",
-# disables shadows on sticky windows:
-#	"_NET_WM_STATE@:32a *= '_NET_WM_STATE_STICKY'",
-# disables shadows on i3 frames
+	# disables shadows on sticky windows:
+	#	"_NET_WM_STATE@:32a *= '_NET_WM_STATE_STICKY'",
+	# disables shadows on i3 frames
 	"class_g ?= 'i3-frame'"
 ];
 
@@ -31,40 +31,24 @@ shadow-exclude = [
 menu-opacity = 0.95;
 #inactive-opacity = 0.93;
 active-opacity = 1;
-alpha-step = 0.01;
+#alpha-step = 0.01; #deprecated
 opacity-rule = [
-#"99:name *?= 'Call'",
-##"99:class_g = 'Chromium'",
-#"99:name *?= 'Conky'",
-#"99:class_g = 'Darktable'",
-#"50:class_g = 'Dmenu'",
-#"99:name *?= 'Event'",
-#"99:class_g = 'Firefox'",
-#"99:class_g = 'GIMP'",
-#"99:name *?= 'Image'",
-#"99:class_g = 'Lazpaint'",
-#"99:class_g = 'Midori'",
-#"99:name *?= 'Minitube'",
-#"99:class_g = 'Mousepad'",
-#"99:name *?= 'MuseScore'",
-#"90:name *?= 'Page Info'",
-#"99:name *?= 'Pale Moon'",
-##"90:name *?= 'Panel'",
-#"99:class_g = 'Pinta'",
-#"90:name *?= 'Restart'",
-#"99:name *?= 'sudo'",
-#"99:name *?= 'Screenshot'",
-#"99:class_g = 'Viewnior'",
-#"99:class_g = 'VirtualBox'",
-#"99:name *?= 'VLC'",
-##"99:name *?= 'Write'",
-#"99:name *?= 'dropdown-terminal'",
-#"93:class_g = 'URxvt' && !_NET_WM_STATE@:32a",
-##"0:_NET_WM_STATE@:32a *= '_NET_WM_STATE_HIDDEN'",
-"80:class_g = 'Xfce4-appfinder'",
-"90:name = 'alttab'",
-"80:class_g = 'copyq'",
-"99:_NET_WM_STATE@:32a *= '_NET_WM_STATE_STICKY'"
+	##"99:class_g = 'Chromium'",
+	#"99:name *?= 'Conky'",
+	#"99:class_g = 'Darktable'",
+	#"50:class_g = 'Dmenu'",
+	#"99:name *?= 'Event'",
+	#"99:class_g = 'Firefox'",
+	#"99:class_g = 'GIMP'",
+	#"99:class_g = 'Mousepad'",
+	#"99:class_g = 'VirtualBox'",
+	#"99:name *?= 'VLC'",
+	#"93:class_g = 'URxvt' && !_NET_WM_STATE@:32a",
+	##"0:_NET_WM_STATE@:32a *= '_NET_WM_STATE_HIDDEN'",
+	"80:class_g = 'Xfce4-appfinder'",
+	"90:name = 'alttab'",
+	"80:class_g = 'copyq'",
+	"99:_NET_WM_STATE@:32a *= '_NET_WM_STATE_STICKY'"
 ];
 
 # dim settings
@@ -96,7 +80,7 @@ refresh-rate = 0;
 #vsync = "drm";
 vsync = "opengl-swc";
 dbe = false;
-paint-on-overlay = true;
+#paint-on-overlay = true; #deprecated
 detect-transient = true;
 detect-client-leader = true;
 invert-color-include = [ ];