Revert "Wallpaper: improved image switching to avoid main thread micro freeze."

This reverts commit 6e368601b4.

Modules/Background/Background.qml

@@ -306,37 +306,20 @@ Variants {
         duration: transitionType == "stripes" ? Settings.data.wallpaper.transitionDuration * 1.6 : Settings.data.wallpaper.transitionDuration
         easing.type: Easing.InOutCubic
         onFinished: {
-          // Strategy: Keep transitionProgress at 1.0 (showing nextWallpaper)
-          // until currentWallpaper finishes loading asynchronously
+          // Assign new image to current BEFORE clearing to prevent flicker
           const tempSource = nextWallpaper.source
-          const tempSourceSize = nextWallpaper.sourceSize
-
-          // Enable async loading to prevent blocking
-          currentWallpaper.asynchronous = true
-
-          // Create one-time connection to wait for async load to complete
-          const onCurrentLoaded = function () {
-            if (currentWallpaper.status === Image.Ready || currentWallpaper.status === Image.Error) {
-              // Disconnect this handler
-              currentWallpaper.statusChanged.disconnect(onCurrentLoaded)
-
-              // Now it's safe to reset progress and cleanup
-              transitionProgress = 0.0
-
-              // Force complete cleanup to free texture memory (~18-25MB per monitor)
-              Qt.callLater(() => {
-                             nextWallpaper.source = ""
-                             nextWallpaper.sourceSize = undefined
-                           })
-            }
-          }
-
-          // Connect the handler BEFORE changing source
-          currentWallpaper.statusChanged.connect(onCurrentLoaded)
-
-          // Trigger async load (keeps nextWallpaper visible via progress=1.0)
-          currentWallpaper.sourceSize = tempSourceSize
           currentWallpaper.source = tempSource
+          transitionProgress = 0.0
+
+          // Now clear nextWallpaper after currentWallpaper has the new source
+          // Force complete cleanup to free texture memory (~18-25MB per monitor)
+          Qt.callLater(() => {
+                         nextWallpaper.source = ""
+                         nextWallpaper.sourceSize = undefined
+                         Qt.callLater(() => {
+                                        currentWallpaper.asynchronous = true
+                                      })
+                       })
         }
       }