Remove replies from hidden events when shown with `messages.ViewSourceEvent` (#6796)
Remove replies from hidden events when shown with `messages.ViewSourceEvent` (#6796)

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"
      }
    }
  }
}
```
matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk