优化

app/src/main/java/io/legado/app/help/glide/OkHttpStreamFetcher.kt

@@ -161,4 +161,4 @@ class OkHttpStreamFetcher(
         }
     }
 
-}
+}

app/src/main/java/io/legado/app/ui/widget/image/CoverImageView.kt

@@ -201,7 +201,10 @@ class CoverImageView @JvmOverloads constructor(
         this.bitmapPath = path
         this.name = name?.replace(AppPattern.bdRegex, "")?.trim()
         this.author = author?.replace(AppPattern.bdRegex, "")?.trim()
-        defaultCover = true
+        if (!defaultCover) {
+            defaultCover = true
+            invalidate()
+        }
         if (AppConfig.useDefaultCover) {
             ImageLoader.load(context, BookCover.defaultDrawable)
                 .centerCrop()