From 50666c130733691adda6da2df879229b99b336b2 Mon Sep 17 00:00:00 2001
From: 01zulfi <85733202+01zulfi@users.noreply.github.com>
Date: Wed, 31 Dec 2025 15:33:21 +0500
Subject: [PATCH] editor: add a collapsible heading test case Signed-off-by:
 01zulfi <85733202+01zulfi@users.noreply.github.com>

---
 .../__snapshots__/heading.test.ts.snap        |  2 ++
 .../heading/__tests__/heading.test.ts         | 21 ++++++++++++++++++-
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/packages/editor/src/extensions/heading/__tests__/__snapshots__/heading.test.ts.snap b/packages/editor/src/extensions/heading/__tests__/__snapshots__/heading.test.ts.snap
index 36f948208..61e8cb4cc 100644
--- a/packages/editor/src/extensions/heading/__tests__/__snapshots__/heading.test.ts.snap
+++ b/packages/editor/src/extensions/heading/__tests__/__snapshots__/heading.test.ts.snap
@@ -4,6 +4,8 @@ exports[`collapse heading > heading collapsed 1`] = `"<h1 data-collapsed="true">
 
 exports[`collapse heading > heading uncollapsed 1`] = `"<h1>Main Heading</h1><p>paragraph.</p><h2>Subheading</h2><p>subheading paragraph</p><h1>Main heading 2</h1><p>paragraph another</p>"`;
 
+exports[`converting collapsed heading to lower level should unhide higher level headings 1`] = `"<h3 data-collapsed="true">Level 1 (to be changed)</h3><h2 data-collapsed="true">Level 2</h2><p data-hidden="true">Paragraph under level 2</p>"`;
+
 exports[`replacing collapsed heading with another heading level should not unhide content 1`] = `"<h2 data-collapsed="true">A collapsed heading</h2><p data-hidden="true">Hidden paragraph</p>"`;
 
 exports[`replacing collapsed heading with another node (blockquote) should unhide content 1`] = `"<blockquote><h1 data-collapsed="true">A collpased heading</h1></blockquote><p>Hidden paragraph</p>"`;
diff --git a/packages/editor/src/extensions/heading/__tests__/heading.test.ts b/packages/editor/src/extensions/heading/__tests__/heading.test.ts
index ac007953c..420e01ffc 100644
--- a/packages/editor/src/extensions/heading/__tests__/heading.test.ts
+++ b/packages/editor/src/extensions/heading/__tests__/heading.test.ts
@@ -17,7 +17,7 @@ You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-import { test, expect } from "vitest";
+import { test, expect, describe } from "vitest";
 import { createEditor, h } from "../../../../test-utils/index.js";
 import { Heading } from "../heading.js";
 import { Editor } from "@tiptap/core";
@@ -125,3 +125,22 @@ test("empty heading should have empty class", () => {
   editor.commands.insertContent("Some content");
   expect(headingElement?.classList.contains("empty")).toBe(false);
 });
+
+test("converting collapsed heading to lower level should unhide higher level headings", () => {
+  const el = h("div", [
+    h("h1", ["Level 1 (to be changed)"], { "data-collapsed": "true" }),
+    h("h2", ["Level 2"], { "data-hidden": "true", "data-collapsed": "true" }),
+    h("p", ["Paragraph under level 2"], { "data-hidden": "true" })
+  ]);
+  const { editor } = createEditor({
+    extensions: {
+      heading: Heading.configure({ levels: [1, 2, 3, 4, 5, 6] })
+    },
+    initialContent: el.outerHTML
+  });
+
+  editor.commands.setTextSelection(0);
+  editor.commands.setHeading({ level: 3 });
+
+  expect(editor.getHTML()).toMatchSnapshot();
+});