- When I Ctrl+click on an email in Gmail, it opens in a new tab, and there I can click "mark as unread" without leaving the email.
- When I just click on an email, then clicking "mark as unread" returns to the list of emails.
How can I mimic in case #2 what happens in case #1, i.e. marking the email as unread but not leaving it? Maybe a bookmarklet or a userscript can do that.