fix: debounce and deduplicate D-Bus theme updates

service/src/main.ct

@@ -50,6 +50,7 @@ func run_file_reaction () {
 func run_dbus_reaction () {
     print ("reaction mode: after dbus signal")
     last_update = 0
+    last_theme = ""
 
     proc = async dbus-monitor ("interface='org.freedesktop.portal.Settings',member=SettingChanged")
     foreach line in proc {
@@ -57,11 +58,14 @@ func run_dbus_reaction () {
         if !is_empty (theme) {
             current_time = date ("+%s%3N")
             diff = current_time - last_update
-            if diff >= 150 {
-                last_update = current_time
+            if diff >= 1000 {
                 new_theme = gsettings ("get", "org.gnome.desktop.interface", "color-scheme") | awk ("-F'", "\{print $2\}")
-                print ("D-Bus signal detected: {theme}")
-                check_and_update_themes (new_theme)
+                if new_theme != last_theme {
+                    last_update = current_time
+                    last_theme = new_theme
+                    print ("D-Bus signal detected: {theme}")
+                    check_and_update_themes (new_theme)
+                }
             }
         }
     }

service/src/themes.ct

@@ -7,8 +7,10 @@ if fs.exists (HOME_PLUGIN_DIR) {
 }
 
 func themes_init_defaults (cfg_path: string) {
+    seen = {}
     foreach name in plugin.list ().split (" ") {
-        if !is_empty (name) {
+        if !is_empty (name) && !seen.has (name) {
+            seen.set (name, true)
             if plugin.has (name, "prefix") {
                 prefix = plugin.call (name, "prefix")
                 light_key = prefix .. "_LIGHT_THEME"
@@ -28,8 +30,10 @@ func themes_update (mode: string, cfg_path: string) {
         suffix = "_DARK_THEME"
     }
 
+    seen = {}
     foreach name in plugin.list ().split (" ") {
-        if !is_empty (name) {
+        if !is_empty (name) && !seen.has (name) {
+            seen.set (name, true)
             available = plugin.call (name, "is_available")
             if available == "true" {
                 if plugin.has (name, "prefix") {