<p>I think <a href="https://gsuiteupdates.googleblog.com/2019/03/threading-changes-in-gmail-conversation-view.html" rel="nofollow">https://gsuiteupdates.googleblog.com/2019/03/threading-changes-in-gmail-conversation-view.html</a> —> additional details would be relevant here: besides the header, we need to make sure that messages that should belong together have the same email subject.</p>

<p style="font-size:small;-webkit-text-size-adjust:none;color:#666;">—<br />You are receiving this because you are subscribed to this thread.<br />Reply to this email directly, <a href="https://github.com/openstreetmap/openstreetmap-website/pull/2462?email_source=notifications&email_token=AAK2OLLU356NR2Z5DQDRJZTQ3MJBZA5CNFSM4JZ3T732YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOEH37XDQ#issuecomment-569899918">view it on GitHub</a>, or <a href="https://github.com/notifications/unsubscribe-auth/AAK2OLNM573VEIL5PRTTJ7DQ3MJBZANCNFSM4JZ3T73Q">unsubscribe</a>.<img src="https://github.com/notifications/beacon/AAK2OLKTMBZGBSB27NZ3LPDQ3MJBZA5CNFSM4JZ3T732YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOEH37XDQ.gif" height="1" width="1" alt="" /></p>
<script type="application/ld+json">[
{
"@context": "http://schema.org",
"@type": "EmailMessage",
"potentialAction": {
"@type": "ViewAction",
"target": "https://github.com/openstreetmap/openstreetmap-website/pull/2462?email_source=notifications\u0026email_token=AAK2OLLU356NR2Z5DQDRJZTQ3MJBZA5CNFSM4JZ3T732YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOEH37XDQ#issuecomment-569899918",
"url": "https://github.com/openstreetmap/openstreetmap-website/pull/2462?email_source=notifications\u0026email_token=AAK2OLLU356NR2Z5DQDRJZTQ3MJBZA5CNFSM4JZ3T732YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOEH37XDQ#issuecomment-569899918",
"name": "View Pull Request"
},
"description": "View this Pull Request on GitHub",
"publisher": {
"@type": "Organization",
"name": "GitHub",
"url": "https://github.com"
}
}
]</script>