优化

app/src/main/java/io/legado/app/service/help/ReadBook.kt

@@ -80,11 +80,15 @@ object ReadBook {
     }
 
     fun setProgress(progress: BookProgress) {
+        if (durChapterIndex != progress.durChapterIndex
+            || durChapterPos != progress.durChapterPos
+        ) {
             durChapterIndex = progress.durChapterIndex
             durChapterPos = progress.durChapterPos
             clearTextChapter()
             loadContent(resetPageOffset = true)
         }
+    }
 
     fun clearTextChapter() {
         prevTextChapter = null