优化

app/src/main/java/io/legado/app/model/CacheBook.kt

@@ -367,6 +367,7 @@ object CacheBook {
                 downloadFinish(chapter, "获取正文失败\n${it.localizedMessage}", resetPageOffset)
             }.onCancel {
                 onCancel(chapter.index)
+                downloadFinish(chapter, "download canceled", resetPageOffset, true)
             }.onFinally {
                 postEvent(EventBus.UP_DOWNLOAD, book.bookUrl)
             }.start()
@@ -375,12 +376,14 @@ object CacheBook {
         private fun downloadFinish(
             chapter: BookChapter,
             content: String,
-            resetPageOffset: Boolean = false
+            resetPageOffset: Boolean = false,
+            canceled: Boolean = false
         ) {
             if (ReadBook.book?.bookUrl == book.bookUrl) {
                 ReadBook.contentLoadFinish(
                     book, chapter, content,
                     resetPageOffset = resetPageOffset,
+                    canceled = canceled
                 )
             }
         }

app/src/main/java/io/legado/app/model/ReadBook.kt

@@ -562,7 +562,7 @@ object ReadBook : CoroutineScope by MainScope() {
                             it,
                             upContent,
                             resetPageOffset,
-                            success
+                            success = success
                         )
                     } ?: download(
                         downloadScope,
@@ -685,10 +685,11 @@ object ReadBook : CoroutineScope by MainScope() {
         content: String,
         upContent: Boolean = true,
         resetPageOffset: Boolean,
+        canceled: Boolean = false,
         success: (() -> Unit)? = null
     ) {
         removeLoading(chapter.index)
-        if (chapter.index !in durChapterIndex - 1..durChapterIndex + 1) {
+        if (canceled || chapter.index !in durChapterIndex - 1..durChapterIndex + 1) {
             return
         }
         Coroutine.async {