Handle deleted/edited thread starting messages (slack). Fixes #600

bridge/slack/handlers.go

@@ -202,6 +202,14 @@ func (b *Bslack) handleStatusEvent(ev *slack.MessageEvent, rmsg *config.Message)
 		rmsg.Event = config.EventJoinLeave
 	case sChannelTopic, sChannelPurpose:
 		rmsg.Event = config.EventTopicChange
+	case sMessageChanged:
+		rmsg.Text = ev.SubMessage.Text
+		// handle deleted thread starting messages
+		if ev.SubMessage.Text == "This message was deleted." {
+			rmsg.Event = config.EventMsgDelete
+			return true
+		}
+
 	case sMessageDeleted:
 		rmsg.Text = config.EventMsgDelete
 		rmsg.Event = config.EventMsgDelete

bridge/slack/slack.go

@@ -48,6 +48,7 @@ const (
 	sChannelLeave    = "channel_leave"
 	sChannelJoined   = "channel_joined"
 	sMemberJoined    = "member_joined_channel"
+	sMessageChanged  = "message_changed"
 	sMessageDeleted  = "message_deleted"
 	sSlackAttachment = "slack_attachment"
 	sPinnedItem      = "pinned_item"