From 45b4237fd5fc05802c3f6eab4f575b4be608ca00 Mon Sep 17 00:00:00 2001
From: Copilot <198982749+Copilot@users.noreply.github.com>
Date: Fri, 24 Jul 2026 09:45:34 -0400
Subject: [PATCH] fix: always render @[userId] mention tokens regardless of
 split test (#35564)
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* Initial plan

* fix: always render @[userId] mention tokens regardless of split test

Readers outside the comment-mentions/email-notifications split tests
were seeing raw @[<userId>] tokens in chat messages and review-panel
comments, leaking internal Mongo ObjectIds.

Fix: always parse and render @[userId] tokens using parseMentions() +
MentionBadge regardless of split-test membership. MentionBadge already
safely falls back to "@Unknown" when a userId can't be resolved to a
project member, so no ID is ever emitted.

- message-content.tsx: remove mentionsFeatureEnabled gate; always call
  renderMentionedContent() instead of falling back to raw <Linkify>
- review-panel-message.tsx: remove mentionsFeatureEnabled gate; always
  pass displayMentions to ExpandableContent

The mentions-input autocomplete (typing new @mentions) remains gated
behind the split test as before — this fix is rendering-only.

Co-authored-by: jdomaga <25135258+jdomaga@users.noreply.github.com>

* feat: always allow for mentions to display

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: jdomaga <25135258+jdomaga@users.noreply.github.com>
Co-authored-by: Jimmy Domagala-Tang <jimmy.domagala-tang@overleaf.com>
GitOrigin-RevId: c7cedbfe6966bb2ebce58a5f4e03b1627198dab7
---
 .../components/review-panel-expandable-content.tsx         | 7 +------
 .../review-panel/components/review-panel-message.tsx       | 3 ---
 2 files changed, 1 insertion(+), 9 deletions(-)

diff --git a/services/web/frontend/js/features/review-panel/components/review-panel-expandable-content.tsx b/services/web/frontend/js/features/review-panel/components/review-panel-expandable-content.tsx
index 9462e0ae71..3f5ff35456 100644
--- a/services/web/frontend/js/features/review-panel/components/review-panel-expandable-content.tsx
+++ b/services/web/frontend/js/features/review-panel/components/review-panel-expandable-content.tsx
@@ -18,7 +18,6 @@ export const ExpandableContent = memo<{
   checkNewLines?: boolean
   inline?: boolean
   translate?: 'yes' | 'no'
-  displayMentions?: boolean
 }>(function ExpandableContent({
   content,
   className,
@@ -27,7 +26,6 @@ export const ExpandableContent = memo<{
   checkNewLines = true,
   inline = false,
   translate,
-  displayMentions = false,
 }) {
   const { t } = useTranslation()
   const contentRef = useRef<HTMLDivElement>(null)
@@ -41,10 +39,7 @@ export const ExpandableContent = memo<{
 
   const isOverflowing = content.length > limit
 
-  const segments = useMemo(
-    () => (displayMentions ? parseMentions(content) : null),
-    [content, displayMentions]
-  )
+  const segments = useMemo(() => parseMentions(content), [content])
 
   const renderedContent = segments
     ? renderSegments(
diff --git a/services/web/frontend/js/features/review-panel/components/review-panel-message.tsx b/services/web/frontend/js/features/review-panel/components/review-panel-message.tsx
index c08cf6ab77..2871d791ee 100644
--- a/services/web/frontend/js/features/review-panel/components/review-panel-message.tsx
+++ b/services/web/frontend/js/features/review-panel/components/review-panel-message.tsx
@@ -15,7 +15,6 @@ import { useUserContext } from '@/shared/context/user-context'
 import ReviewPanelEntryUser from './review-panel-entry-user'
 import { usePermissionsContext } from '@/features/ide-react/context/permissions-context'
 import { PreventSelectingEntry } from './review-panel-prevent-selecting'
-import { mentionsFeatureEnabled } from '@/shared/utils/mentions'
 
 export const ReviewPanelMessage: FC<{
   message: ReviewPanelCommentThreadMessage
@@ -44,7 +43,6 @@ export const ReviewPanelMessage: FC<{
   const hasSubmittedRef = useRef(false)
   const user = useUserContext()
   const permissions = usePermissionsContext()
-  const mentionsEnabled = mentionsFeatureEnabled()
 
   const isCommentAuthor = Boolean(message.user && user.id === message.user.id)
   const canEdit = isCommentAuthor && permissions.comment
@@ -147,7 +145,6 @@ export const ReviewPanelMessage: FC<{
           checkNewLines
           content={message.content}
           translate="no"
-          displayMentions={mentionsEnabled}
         />
       )}