🐛(frontend) preserve title when adding an emoji

The emoji action could reuse a stale document title while a rename was being
submitted, replacing the new title with the emoji alone.

Keep the latest submitted title in the header and cover the interaction
with a regression test.

Signed-off-by: fch-aa <21101725+fch-aa@users.noreply.github.com>

CHANGELOG.md

@@ -6,6 +6,10 @@ and this project adheres to
 
 ## [Unreleased]
 
+### Fixed
+
+- 🐛(frontend) preserve page titles when adding an emoji #2586
+
 ## [v5.6.1] - 2026-09-04
 
 ### Added

src/frontend/apps/impress/src/features/docs/doc-header/__tests__/DocHeaderEmoji.spec.tsx

@@ -4,12 +4,16 @@ import { afterEach, beforeEach, describe, expect, test, vi } from 'vitest';
 import { AppWrapper } from '@/tests/utils';
 
 const mockUpdateDocEmoji = vi.fn();
+const mockUpdateDocTitle = vi.fn((_doc: unknown, title: string) => title);
 
 vi.mock('@/docs/doc-management', async () => {
   const actual = await vi.importActual('@/docs/doc-management');
   return {
     ...actual,
-    useDocTitleUpdate: () => ({ updateDocEmoji: mockUpdateDocEmoji }),
+    useDocTitleUpdate: () => ({
+      updateDocEmoji: mockUpdateDocEmoji,
+      updateDocTitle: mockUpdateDocTitle,
+    }),
   };
 });
 
@@ -33,6 +37,7 @@ describe('DocHeader - Add emoji (April Fools easter egg)', () => {
   beforeEach(() => {
     vi.useFakeTimers();
     mockUpdateDocEmoji.mockClear();
+    mockUpdateDocTitle.mockClear();
   });
 
   afterEach(() => {
@@ -58,4 +63,23 @@ describe('DocHeader - Add emoji (April Fools easter egg)', () => {
       );
     });
   });
+
+  test('preserves a title changed immediately before adding an emoji', () => {
+    vi.setSystemTime(new Date('2026-03-30'));
+
+    render(<DocHeader doc={{ ...doc, title: '' }} />, {
+      wrapper: AppWrapper,
+    });
+
+    const titleInput = screen.getByRole('textbox', { name: 'Document title' });
+    titleInput.textContent = 'My new document';
+    fireEvent.blur(titleInput);
+    fireEvent.click(screen.getByRole('button', { name: 'Add icon' }));
+
+    expect(mockUpdateDocEmoji).toHaveBeenCalledWith(
+      'doc-1',
+      'My new document',
+      '📄',
+    );
+  });
 });

src/frontend/apps/impress/src/features/docs/doc-header/components/DocHeader.tsx

@@ -1,4 +1,5 @@
 import { Button } from '@gouvfr-lasuite/ui-components';
+import { useEffect, useRef } from 'react';
 import { useTranslation } from 'react-i18next';
 import { css } from 'styled-components';
 
@@ -31,6 +32,11 @@ export const DocHeader = ({ doc }: DocHeaderProps) => {
   const { updateDocEmoji } = useDocTitleUpdate();
   const { isTopRoot } = useDocUtils(doc);
   const displayEmojiButton = doc.abilities.partial_update && !isTopRoot;
+  const latestTitleRef = useRef(doc.title ?? '');
+
+  useEffect(() => {
+    latestTitleRef.current = doc.title ?? '';
+  }, [doc.title]);
 
   return (
     <>
@@ -74,10 +80,10 @@ export const DocHeader = ({ doc }: DocHeaderProps) => {
                   const isAprilFools =
                     today.getMonth() === 3 && today.getDate() === 1;
                   emoji
-                    ? updateDocEmoji(doc.id, doc.title ?? '', '')
+                    ? updateDocEmoji(doc.id, latestTitleRef.current, '')
                     : updateDocEmoji(
                         doc.id,
-                        doc.title ?? '',
+                        latestTitleRef.current,
                         isAprilFools ? '🐟' : '📄',
                       );
                 }}
@@ -97,7 +103,12 @@ export const DocHeader = ({ doc }: DocHeaderProps) => {
               </Button>
             )}
           </Box>
-          <DocTitle doc={doc} />
+          <DocTitle
+            doc={doc}
+            onTitleUpdate={(title) => {
+              latestTitleRef.current = title;
+            }}
+          />
           <DocHeaderInfo doc={doc} />
         </Box>
         <HorizontalSeparator $margin={{ top: '24px' }} />

src/frontend/apps/impress/src/features/docs/doc-header/components/DocTitle.tsx

@@ -21,9 +21,10 @@ export const CLASS_DOC_TITLE = '--docs--doc-title';
 
 interface DocTitleProps {
   doc: Doc;
+  onTitleUpdate?: (title: string) => void;
 }
 
-export const DocTitle = ({ doc }: DocTitleProps) => {
+export const DocTitle = ({ doc, onTitleUpdate }: DocTitleProps) => {
   const { isEditable, isLoading } = useIsCollaborativeEditable(doc);
   const readOnly = !doc.abilities.partial_update || !isEditable || isLoading;
 
@@ -31,7 +32,7 @@ export const DocTitle = ({ doc }: DocTitleProps) => {
     return <DocTitleText />;
   }
 
-  return <DocTitleInput doc={doc} />;
+  return <DocTitleInput doc={doc} onTitleUpdate={onTitleUpdate} />;
 };
 
 export const DocTitleText = () => {
@@ -103,7 +104,7 @@ const DocTitleEmojiPicker = ({ doc }: DocTitleProps) => {
   );
 };
 
-const DocTitleInput = ({ doc }: DocTitleProps) => {
+const DocTitleInput = ({ doc, onTitleUpdate }: DocTitleProps) => {
   const { isSmallMobile } = useResponsiveStore();
   const { t } = useTranslation();
   const { isTopRoot } = useDocUtils(doc);
@@ -121,6 +122,8 @@ const DocTitleInput = ({ doc }: DocTitleProps) => {
       if (isTopRoot) {
         const sanitizedTitle = updateDocTitle(doc, inputText);
         setTitleDisplay(sanitizedTitle);
+        onTitleUpdate?.(sanitizedTitle);
+
         return sanitizedTitle;
       } else {
         const { emoji: pastedEmoji } = getEmojiAndTitle(inputText);
@@ -136,9 +139,10 @@ const DocTitleInput = ({ doc }: DocTitleProps) => {
           getEmojiAndTitle(sanitizedTitle);
 
         setTitleDisplay(sanitizedTitleWithoutEmoji);
+        onTitleUpdate?.(sanitizedTitle);
       }
     },
-    [updateDocTitle, doc, emoji, isTopRoot],
+    [updateDocTitle, doc, emoji, isTopRoot, onTitleUpdate],
   );
 
   const handleKeyDown = (e: React.KeyboardEvent) => {