For #27055: handle legacy wallpaper naming case

app/src/main/java/org/mozilla/fenix/wallpapers/Wallpaper.kt

@@ -132,11 +132,14 @@ data class Wallpaper(
 
         /**
          * Check if a wallpaper name matches the default. Considers empty strings to be default
-         * since that likely means a wallpaper has never been set.
+         * since that likely means a wallpaper has never been set. The "none" case here is to deal
+         * with a legacy case where the default wallpaper used to be Wallpaper.NONE. See
+         * commit 7a44412, Wallpaper.NONE and Settings.currentWallpaper (legacy name) for context.
          *
          * @param name The name to check.
          */
-        fun nameIsDefault(name: String): Boolean = name.isEmpty() || name == defaultName
+        fun nameIsDefault(name: String): Boolean =
+            name.isEmpty() || name == defaultName || name.lowercase() == "none"
     }
 
     /**

app/src/test/java/org/mozilla/fenix/wallpapers/WallpaperTest.kt

@@ -25,4 +25,11 @@ class WallpaperTest {
 
         assertFalse(result)
     }
+
+    @Test
+    fun `GIVEN the legacy wallpaper default name none WHEN checking whether the current wallpaper should be default THEN return true`() {
+        val result = Wallpaper.nameIsDefault("NONE")
+
+        assertTrue(result)
+    }
 }