Protect live state during restore and reset

config/dot/quickshell/services/Wallpaper.qml

@@ -33,6 +33,7 @@ Singleton {
     property bool scanning: false
 
     readonly property string configured: DesktopPreferences.get("wallpaperPath")
+    readonly property string shippedPath: `${Quickshell.env("HOME")}/Pictures/Wallpapers/faroe_islands.jpg`
 
     // Directories searched for wallpapers, in order. Screenshots are
     // deliberately excluded: a folder of 300 screenshots is not a wallpaper
@@ -85,6 +86,7 @@ Singleton {
         id: apply
 
         property string requested: ""
+        property string storedValue: ""
         property var remaining: []
 
         onExited: (exitCode, exitStatus) => {
@@ -100,7 +102,7 @@ Singleton {
                 return;
             }
             root.lastError = "";
-            DesktopPreferences.set("wallpaperPath", apply.requested);
+            DesktopPreferences.set("wallpaperPath", apply.storedValue);
             root.refreshActive();
         }
     }
@@ -140,19 +142,16 @@ Singleton {
     // Applies to every connected output. Returns false when the path is not one
     // the schema will accept, so a caller can report the refusal.
     function set(path: string): bool {
-        if (PreferenceSchema.coerce("wallpaperPath", path) === undefined) {
+        const effectivePath = path === "" ? root.shippedPath : path;
+        if (PreferenceSchema.coerce("wallpaperPath", effectivePath) === undefined) {
             root.lastError = "That file path cannot be used as a wallpaper.";
             return false;
         }
         if (apply.running)
             return false;
 
-        apply.requested = path;
-        // "" clears the preference without touching what is on screen.
-        if (path === "") {
-            DesktopPreferences.set("wallpaperPath", "");
-            return true;
-        }
+        apply.requested = effectivePath;
+        apply.storedValue = path;
 
         const outputs = Quickshell.screens.map(screen => screen.name).filter(name => !!name);
         if (outputs.length === 0) {
@@ -161,7 +160,7 @@ Singleton {
         }
 
         apply.remaining = outputs.slice(1);
-        apply.exec(["hyprctl", "hyprpaper", "wallpaper", `${outputs[0]},${path}`]);
+        apply.exec(["hyprctl", "hyprpaper", "wallpaper", `${outputs[0]},${effectivePath}`]);
         return true;
     }