优化

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

@@ -77,9 +77,11 @@ class BookInfoViewModel(application: Application) : BaseViewModel(application) {
             BookCover.searchCover(book)?.let { coverUrl ->
                 book.customCoverUrl = coverUrl
                 bookData.postValue(book)
+                if (inBookshelf) {
                     saveBook(book)
                 }
             }
+        }
         bookSource = if (book.isLocalBook()) {
             null
         } else {