fix(settings): detect nix-managed settings updates without restart

Commons/Settings.qml

@@ -18,6 +18,7 @@ Singleton {
   property bool directoriesCreated: false
   property bool shouldOpenSetupWizard: false
   property bool isFreshInstall: false
+  property string lastLoadedSettingsText: ""
 
   /*
   Shell directories.
@@ -80,6 +81,20 @@ Singleton {
     }
   }
 
+  // Fallback polling for environments where watcher events are missed
+  // (e.g. atomic symlink/store-path swaps in declarative setups).
+  Timer {
+    id: settingsWatchdogTimer
+    running: false
+    repeat: true
+    interval: 5000
+    onTriggered: {
+      if (root.isLoaded && settingsFileView.path !== undefined) {
+        settingsFileView.reload();
+      }
+    }
+  }
+
   FileView {
     id: settingsFileView
     path: directoriesCreated ? settingsFile : undefined
@@ -95,10 +110,14 @@ Singleton {
     // Trigger initial load when path changes from empty to actual path
     onPathChanged: {
       if (path !== undefined) {
+        settingsWatchdogTimer.start();
         reload();
+      } else {
+        settingsWatchdogTimer.stop();
       }
     }
     onLoaded: function () {
+      var currentText = settingsFileView.text();
       if (!isLoaded) {
         Logger.i("Settings", "Settings loaded");
 
@@ -115,6 +134,7 @@ Singleton {
 
         // Finally, update our local settings version
         adapter.settingsVersion = settingsVersion;
+        root.lastLoadedSettingsText = currentText;
 
         // Emit the signal
         root.isLoaded = true;
@@ -122,6 +142,10 @@ Singleton {
 
         upgradeSettings();
       } else {
+        if (currentText === root.lastLoadedSettingsText) {
+          return;
+        }
+        root.lastLoadedSettingsText = currentText;
         Logger.d("Settings", "Settings reloaded from external file change");
         root.settingsReloaded();
       }