优化

app/src/main/java/io/legado/app/base/adapter/DiffRecyclerAdapter.kt

@@ -49,11 +49,7 @@ abstract class DiffRecyclerAdapter<ITEM, VB : ViewBinding>(protected val context
     @Synchronized
     fun setItems(items: List<ITEM>?) {
         kotlin.runCatching {
-            if (items == null) {
-                asyncListDiffer.submitList(null)
-            } else {
-                asyncListDiffer.submitList(ArrayList(items))
-            }
+            asyncListDiffer.submitList(items)
         }
     }
 

app/src/main/java/io/legado/app/ui/book/changecover/ChangeCoverViewModel.kt

@@ -37,7 +37,7 @@ class ChangeCoverViewModel(application: Application) : BaseViewModel(application
         searchSuccess = {
             if (!searchBooks.contains(it)) {
                 searchBooks.add(it)
-                trySend(searchBooks)
+                trySend(ArrayList(searchBooks))
             }
         }