fix: DocumentMarkdownDecoder convert image error when md.Node.Children > 1 and md.Node.Children include img element

lib/src/plugins/markdown/decoder/document_markdown_decoder.dart

@@ -29,8 +29,9 @@ class DocumentMarkdownDecoder extends Converter<String, Document> {
       encodeHtml: false,
     ).parse(formattedMarkdown);
 
+    final List<md.Node> processedNodes = _processNodes(mdNodes);
     final document = Document.blank();
-    final nodes = mdNodes
+    final nodes = processedNodes
         .map((e) => _parseNode(e))
         .nonNulls
         .flattened
@@ -42,6 +43,48 @@ class DocumentMarkdownDecoder extends Converter<String, Document> {
     return document;
   }
 
+  List<md.Node> _processNodes(List<md.Node> nodes) {
+    List<md.Node> result = [];
+
+    for (var node in nodes) {
+      if (node is md.Element &&
+          node.children != null &&
+          node.children!.length > 1) {
+        // Store image elements that need to be extracted
+        List<int> imageIndices = [];
+
+        // Find all image elements
+        for (var i = 0; i < node.children!.length; i++) {
+          var child = node.children![i];
+          if (child is md.Element && child.tag == 'img') {
+            imageIndices.add(i);
+          }
+        }
+
+        if (imageIndices.isNotEmpty) {
+          // Extract images from back to front to maintain correct indices
+          for (var i = imageIndices.length - 1; i >= 0; i--) {
+            var index = imageIndices[i];
+            var imageElement = node.children!.removeAt(index);
+            // Create a paragraph element containing the image
+            result.add(md.Element('p', [imageElement]));
+          }
+
+          // Add the original node if it still has children
+          if (node.children!.isNotEmpty) {
+            result.add(node);
+          }
+        } else {
+          result.add(node);
+        }
+      } else {
+        result.add(node);
+      }
+    }
+
+    return result;
+  }
+
   // handle node itself and its children
   List<Node> _parseNode(md.Node mdNode) {
     List<Node> nodes = [];

test/plugins/markdown/document_markdown_test.dart

@@ -57,6 +57,32 @@ void main() {
       expect(nodes[0].delta?.toPlainText(), 'This is the first line');
       expect(nodes[1].attributes['url'], 'https://example.com/image.png');
     });
+
+    test('paragraph + image with custom style', () {
+      const markdown = '''![](http://test.com/1.png)
+**第一幕：奇葩公司新规**
+入职第一天发现我们公司有个祖传制度——迟到1分钟要讲1个笑话。前台小姐姐神秘兮兮地说："上周市场部Jason讲了三个谐音梗，现在还在走廊罚站呢。"我盯着手机屏幕的9:01分，感觉今天要成为《饥饿游戏》真人版主角。
+
+`![](http://test.com/2.png)
+**第二幕：社恐の终极挑战**
+当我抱着简历冲进会议室时，行政总监、HR和部门主管突然集体转身。别问，问就是三堂会审现场。更可怕的是行政总监脖子上挂着"今日段子质检员"工牌，手里还攥着评分表！此时投影仪突然发出放屁般的故障音，大老板推门而入："听说新同事准备了特别节目？"''';
+      final document = markdownToDocument(markdown);
+      final nodes = document.root.children;
+      expect(nodes.length, 6); // 2 images + 4 paragraphs
+      expect(nodes[0].attributes['url'], 'http://test.com/1.png');
+      expect(nodes[1].delta?.toPlainText(), '第一幕：奇葩公司新规');
+      expect(
+        nodes[2].delta?.toPlainText(),
+        '入职第一天发现我们公司有个祖传制度——迟到1分钟要讲1个笑话。前台小姐姐神秘兮兮地说："上周市场部Jason讲了三个谐音梗，现在还在走廊罚站呢。"我盯着手机屏幕的9:01分，感觉今天要成为《饥饿游戏》真人版主角。',
+      );
+
+      expect(nodes[3].attributes['url'], 'http://test.com/2.png');
+      expect(nodes[4].delta?.toPlainText(), '第二幕：社恐の终极挑战');
+      expect(
+        nodes[5].delta?.toPlainText(),
+        '当我抱着简历冲进会议室时，行政总监、HR和部门主管突然集体转身。别问，问就是三堂会审现场。更可怕的是行政总监脖子上挂着"今日段子质检员"工牌，手里还攥着评分表！此时投影仪突然发出放屁般的故障音，大老板推门而入："听说新同事准备了特别节目？"',
+      );
+    });
   });
 }