优化链接分割规则，避免附加参数中存在 ,{ 时导致规则切错

修复<str0,str2,...{{js}}>这种页数列表写法中，js部分内含 < 或 > 会切割错误的问题

格式化图片和匹配图片规则不在使用同一个正则，加快图片处理速度。

优化一下不需要循环执行却被循环执行的操作

app/src/main/java/io/legado/app/ui/book/read/page/provider/ChapterProvider.kt

@@ -111,9 +111,11 @@ object ChapterProvider {
                     )
                 }
             } else if (book.getImageStyle() != Book.imgStyleText) {
-                content.replace(AppPattern.imgPattern.toRegex(), "\n\$0\n")
-                    .split("\n").forEach { text ->
-                        if (text.isNotBlank()) {
+                var contentX = content.replace(AppPattern.imgPattern.toRegex(), "\n\$0\n").split("\n")
+                val start = contentX.first() == "\n"
+                val end = contentX.last() == "\n"
+                if(start || end )contentX = contentX.subList(if(start) 1 else 0,if(end) contentX.size-1 else contentX.size )
+                contentX.forEach { text ->
                     if (!text.startsWith("<img src=\"")) { //非图片
                         val isTitle = index == 0
                         val textPaint = if (isTitle) titlePaint else contentPaint
@@ -132,7 +134,6 @@ object ChapterProvider {
                 }
             }
         }
-        }
         textPages.last().height = durY + 20.dp
         textPages.last().text = stringBuilder.toString()
         textPages.forEachIndexed { index, item ->

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

@@ -59,16 +59,17 @@ object HtmlFormatter {
 
                 do{
                     val url = matcher.group(1)!!
-                    val pos = url.indexOf(',')
-                    sb.append(keepImgHtml.substring(appendPos, matcher.start()).replace("\n","\n　　")) //非图片部分换行缩减
+                    val urlBefore = url.substringBefore(',')
+                    val beforeStr = keepImgHtml.substring(appendPos, matcher.start())
+                    sb.append( if(beforeStr == "\n") '\n' else beforeStr.replace("\n","\n　　") ) //缩进换行下个非图片段落
                     sb.append(
                         "<img src=\"${
                             NetworkUtils.getAbsoluteURL(
                                 redirectUrl,
-                                url.substring(0, pos)
+                                urlBefore
                             )
-                        },${
-                            url.substring(pos + 1 )
+                        }${
+                            url.substring(urlBefore.length)
                         }\">"
                     )
                     appendPos = matcher.end()
@@ -78,7 +79,8 @@ object HtmlFormatter {
         }
 
         if (appendPos < keepImgHtml.length) {
-            sb.append(keepImgHtml.substring(appendPos, keepImgHtml.length).replace("\n","\n　　")) //非图片部分换行缩减
+            val beforeStr = keepImgHtml.substring(appendPos, keepImgHtml.length)
+            sb.append( if(beforeStr == "\n") '\n' else beforeStr.replace("\n","\n　　") ) //缩进换行下个非图片段落
         }
         return sb.toString()
     }