修复htmlFormatter错误

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

@@ -22,8 +22,9 @@ object HtmlFormatter {
 
     fun formatKeepImg(html: String?, redirectUrl: URL?): String {
         html ?: return ""
+        val keepImgHtml = formatKeepImg(html)
         val sb = StringBuffer()
-        val matcher = AppPattern.imgPattern.matcher(formatKeepImg(html))
+        val matcher = AppPattern.imgPattern.matcher(keepImgHtml)
         var appendPos = 0
         while (matcher.find()) {
             val urlArray = matcher.group(1)!!.split(AnalyzeUrl.splitUrlRegex)
@@ -31,12 +32,12 @@ object HtmlFormatter {
             if (urlArray.size > 1) {
                 url = "$url,${urlArray[1]}"
             }
-            sb.append(html.substring(appendPos, matcher.start()))
+            sb.append(keepImgHtml.substring(appendPos, matcher.start()))
             sb.append("<img src=\"$url\" >")
             appendPos = matcher.end()
         }
-        if (appendPos < html.length) {
-            sb.append(html.substring(appendPos, html.length))
+        if (appendPos < keepImgHtml.length) {
+            sb.append(keepImgHtml.substring(appendPos, keepImgHtml.length))
         }
         return sb.toString()
     }