优化

app/src/main/java/io/legado/app/ui/book/info/BookInfoViewModel.kt

@@ -256,6 +256,7 @@ class BookInfoViewModel(application: Application) : BaseViewModel(application) {
                             ReadBook.book = book
                             ReadBook.chapterSize = book.totalChapterNum
                             ReadBook.simulatedChapterSize = book.simulatedTotalChapterNum()
+                            ReadBook.clearTextChapter()
                         }
                     }
                     bookData.postValue(book)

app/src/main/java/io/legado/app/ui/main/MainViewModel.kt

@@ -173,6 +173,7 @@ class MainViewModel(application: Application) : BaseViewModel(application) {
                 ReadBook.book = book
                 ReadBook.chapterSize = book.totalChapterNum
                 ReadBook.simulatedChapterSize = book.simulatedTotalChapterNum()
+                ReadBook.clearTextChapter()
             }
             addDownload(source, book)
         }.onFailure {