No notifications are sent for mentions in review comments

[jpraet]

• Gitea version (or commit ref): 1.13.0
• Can you reproduce the bug at https://try.gitea.io:
  • Yes (provide example URL)
  • No

Description

When @mentioning someone in a code review comment, no notification is sent.

[a1012112796]

Not support it now.

[a1012112796]

suggest label this issue as good first issue.