As discovered in https://github.com/vector-im/element-web/issues/10391#is
Previously, if you turned on the `showHiddenEventsInTimeline` labs flag, edit (`m.replace`) events
that also have a `m.in_reply_to` field, will show the reply in the timeline.
ex.
```
{
"type": "m.room.message",
"content": {
"body": " * foo",
"msgtype": "m.text",
"m.new_content": {
"body": "foo",
"msgtype": "m.text"
},
"m.relates_to": {
"rel_type": "m.replace",
"event_id": "$yvuev9bF2nLRf8fscG55njpVjY3FHJzWgZ4BKI9_0eg",
"m.in_reply_to": {
"event_id": "$qkjmFBTEc0VvfVyzq1CJuh1QZi_xDIgNEFjZ4Pq34og"
}
}
}
}
```
Eric EastwoodandGitHub
fddc20dd89