优化

app/src/main/java/io/legado/app/utils/HtmlFormatter.kt

@@ -50,7 +50,7 @@ object HtmlFormatter {
                         var appendPos0 = 0
                         val matcher0 = Pattern.compile("<img[^>]*src *= *\"([^\"]+)\"[^>]*>", Pattern.CASE_INSENSITIVE).matcher(strBefore) //格式化普通图片标签
                         while (matcher0.find()) {
-                            val strBefore0 = strBefore.substring(appendPos, matcher.start())
+                            val strBefore0 = strBefore.substring(appendPos0, matcher.start())
                             sb.append( if (strBefore0.isBlank()) strBefore0 else strBefore0.replace("\n","\n　　"))
                             sb.append("<img src=\"${NetworkUtils.getAbsoluteURL(redirectUrl,matcher.group(1)!!)}\">")
                             appendPos0 = matcher.end()