[19.0][FIX] document_page: history_head after content edit

document_page/models/document_page.py

@@ -162,11 +162,10 @@ def _search_content(self, operator, value):
 
     @api.depends("history_ids")
     def _compute_history_head(self):
+        # history_ids is not sorted by _order in cache: a revision created
+        # during write() comes last, so pick the newest one explicitly.
         for rec in self:
-            if rec.history_ids:
-                rec.history_head = rec.history_ids[0]
-            else:
-                rec.history_head = False
+            rec.history_head = rec.history_ids.sorted("id", reverse=True)[:1]
 
     @api.onchange("parent_id")
     def _onchange_parent_id(self):

document_page/tests/test_document_page.py

@@ -42,6 +42,20 @@ def test_page_creation(self):
         page.content = "<p>New content for Demo Page</p>"
         self.assertEqual(len(page.history_ids), 2)
 
+    def test_page_edit_keeps_new_content(self):
+        page = self.page_obj.create(
+            {
+                "name": "Test Page 2",
+                "parent_id": self.category1.id,
+                "content": "<p>v1</p>",
+            }
+        )
+        page.write({"content": "<p>v2</p>"})
+        self.env.flush_all()
+        self.env.invalidate_all()
+        self.assertEqual(page.history_head, page.history_ids.sorted("id")[-1])
+        self.assertEqual(page.content, "<p>v2</p>")
+
     def test_category_template(self):
         page = self.page_obj.create(
             {"name": "Test Page 2", "parent_id": self.category1.id}