For #23144 Address regression in COLD start

app/src/main/java/org/mozilla/fenix/home/HomeFragment.kt

@@ -126,6 +126,7 @@ import org.mozilla.fenix.settings.deletebrowsingdata.deleteAndQuit
 import org.mozilla.fenix.theme.ThemeManager
 import org.mozilla.fenix.utils.ToolbarPopupWindow
 import org.mozilla.fenix.utils.allowUndo
+import org.mozilla.fenix.wallpapers.Wallpaper
 import org.mozilla.fenix.whatsnew.WhatsNew
 import java.lang.ref.WeakReference
 import kotlin.math.min
@@ -390,16 +391,20 @@ class HomeFragment : Fragment() {
 
         requireContext().components.analytics.experiments.recordExposureEvent(FeatureId.HOME_PAGE)
 
+        if (shouldEnableWallpaper()) {
+            val wallpaperManger = requireComponents.wallpaperManager
+            // We only want to update the wallpaper when it's different from the default one
+            // as the default is applied already on xml by default.
+            if (wallpaperManger.currentWallpaper != Wallpaper.NONE) {
+                wallpaperManger.updateWallpaper(binding.homeLayout, wallpaperManger.currentWallpaper)
+            }
+        }
+
         // DO NOT MOVE ANYTHING BELOW THIS addMarker CALL!
         requireComponents.core.engine.profiler?.addMarker(
             MarkersFragmentLifecycleCallbacks.MARKER_NAME, profilerStartTime, "HomeFragment.onCreateView",
         )
 
-        if (shouldEnableWallpaper()) {
-            val wallpaperManger = requireComponents.wallpaperManager
-            wallpaperManger.updateWallpaper(binding.homeLayout, wallpaperManger.currentWallpaper)
-        }
-
         return binding.root
     }
 

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

@@ -7,6 +7,7 @@ package org.mozilla.fenix.wallpapers
 import android.content.Context
 import android.view.View
 import androidx.appcompat.app.AppCompatDelegate
+import mozilla.components.support.base.log.logger.Logger
 import mozilla.components.support.ktx.android.content.getColorFromAttr
 import org.mozilla.fenix.ext.asActivity
 import org.mozilla.fenix.utils.Settings
@@ -15,7 +16,7 @@ import org.mozilla.fenix.utils.Settings
  * Provides access to available wallpapers and manages their states.
  */
 class WallpaperManager(private val settings: Settings) {
-
+    val logger = Logger("WallpaperManager")
     var currentWallpaper: Wallpaper = getCurrentWallpaperFromSettings()
         set(value) {
             settings.currentWallpaper = value.name
@@ -29,7 +30,9 @@ class WallpaperManager(private val settings: Settings) {
         if (newWallpaper == Wallpaper.NONE) {
             val context = wallpaperContainer.context
             wallpaperContainer.setBackgroundColor(context.getColorFromAttr(newWallpaper.drawable))
+            logger.info("Wallpaper update to default background")
         } else {
+            logger.info("Wallpaper update to ${newWallpaper.name}")
             wallpaperContainer.setBackgroundResource(newWallpaper.drawable)
         }
         currentWallpaper = newWallpaper
@@ -41,8 +44,10 @@ class WallpaperManager(private val settings: Settings) {
         val mode = if (currentWallpaper != Wallpaper.NONE) {
             if (currentWallpaper.isDark) {
                 updateThemePreference(useDarkTheme = true)
+                logger.info("theme changed to useDarkTheme")
                 AppCompatDelegate.MODE_NIGHT_YES
             } else {
+                logger.info("theme changed to useLightTheme")
                 updateThemePreference(useLightTheme = true)
                 AppCompatDelegate.MODE_NIGHT_NO
             }
@@ -55,6 +60,7 @@ class WallpaperManager(private val settings: Settings) {
 
         if (AppCompatDelegate.getDefaultNightMode() != mode) {
             AppCompatDelegate.setDefaultNightMode(mode)
+            logger.info("theme updated activity recreated")
             context.asActivity()?.recreate()
         }
     }