优化

app/src/main/java/io/legado/app/ui/book/toc/ChapterListAdapter.kt

@@ -56,10 +56,6 @@ class ChapterListAdapter(context: Context, val callback: Callback) :
 
         }
 
-    private val replaceRules
-        get() = callback.book?.let {
-            ContentProcessor.get(it.name, it.origin).getTitleReplaceRules()
-        }
     private var upDisplayTileJob: Coroutine<*>? = null
 
     override fun onCurrentListChanged() {
@@ -75,8 +71,9 @@ class ChapterListAdapter(context: Context, val callback: Callback) :
     fun upDisplayTitle(startIndex: Int) {
         upDisplayTileJob?.cancel()
         upDisplayTileJob = Coroutine.async(callback.scope) {
-            val replaceRules = replaceRules
-            val useReplace = AppConfig.tocUiUseReplace && callback.book?.getUseReplaceRule() == true
+            val book = callback.book ?: return@async
+            val replaceRules = ContentProcessor.get(book.name, book.origin).getTitleReplaceRules()
+            val useReplace = AppConfig.tocUiUseReplace && book.getUseReplaceRule()
             val items = getItems()
             async {
                 for (i in startIndex until items.size) {