fix: handle local mindmap trash and block insertion

rust/spikes/leptos-tiptap-spike/src/lib.rs

@@ -3349,6 +3349,38 @@ mod tests {
             "mnote.leptos-tiptap-spike.document:mindmap-object:doc-a:mind-a"
         );
     }
+
+    #[test]
+    fn mindmap_empty_paragraph_has_textblock_boundary_size() {
+        let node = json!({
+            "type": "paragraph",
+            "attrs": {
+                "mnoteBlockType": "mindmap",
+                "mindmapId": "思维导图123456.json",
+                "rootNodeId": "root",
+                "projectionVersion": 1
+            }
+        });
+        assert_eq!(prosemirror_node_size(&node), Some(2));
+
+        let document = json!({
+            "type": "doc",
+            "content": [
+                {"type": "paragraph", "content": [{"type": "text", "text": "上"}]},
+                node,
+                {"type": "paragraph", "content": [{"type": "text", "text": "下"}]}
+            ]
+        });
+
+        assert_eq!(
+            top_level_block_boundary_position(&document, 1, true),
+            Some(3)
+        );
+        assert_eq!(
+            top_level_block_boundary_position(&document, 1, false),
+            Some(5)
+        );
+    }
 }
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
@@ -5335,7 +5367,13 @@ fn prosemirror_node_size(node: &Value) -> Option<u32> {
         Some("hardBreak") | Some("horizontalRule") => Some(1),
         _ => {
             let Some(children) = node.get("content").and_then(Value::as_array) else {
-                return Some(1);
+                return Some(match node.get("type").and_then(Value::as_str) {
+                    Some("paragraph") | Some("heading") | Some("blockquote")
+                    | Some("codeBlock") | Some("bulletList") | Some("orderedList")
+                    | Some("taskList") | Some("listItem") | Some("taskItem") | Some("table")
+                    | Some("tableRow") | Some("tableCell") | Some("tableHeader") => 2,
+                    _ => 1,
+                });
             };
 
             let content_size = children.iter().try_fold(0_u32, |acc, child| {