fix scrollView顶部时下拉刷新

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

@@ -423,9 +423,13 @@ class BookInfoActivity :
                 }
             }
         }
+
         refreshLayout?.setOnRefreshListener {
-            refreshLayout.isRefreshing = false
+            // scrollView 顶部
-            refreshBook()
+            if (scrollView.scrollY <= 0) {
+                refreshLayout.isRefreshing = false
+                refreshBook()
+            }
         }
     }