优化

app/src/main/java/io/legado/app/help/book/BookHelp.kt

@@ -118,8 +118,7 @@ object BookHelp {
         content: String
     ) = coroutineScope {
         val awaitList = arrayListOf<Deferred<Unit>>()
-        content.split("\n").forEach {
+        val matcher = AppPattern.imgPattern.matcher(content)
-            val matcher = AppPattern.imgPattern.matcher(it)
         while (matcher.find()) {
             matcher.group(1)?.let { src ->
                 val mSrc = NetworkUtils.getAbsoluteURL(bookChapter.url, src)
@@ -128,7 +127,6 @@ object BookHelp {
                 })
             }
         }
-        }
         awaitList.forEach {
             it.await()
         }