message_changed message event

{
	"type": "message",
	"subtype": "message_changed",
	"hidden": true,
	"channel": "C123ABC456",
	"ts": "1358878755.000001",
	"message": {
		"type": "message",
		"user": "U123ABC456",
		"text": "Hello, world!",
		"ts": "1355517523.000005",
		"edited": {
			"user": "U123ABC456",
			"ts": "1358878755.000001"
		}
	}
}

A message_changed message is sent when a message in a channel is edited using the chat.update method. The message property contains the updated message object.

When clients receive this message type, they should look for an existing message with the same message.ts in that channel. If they find one the existing message should be replaced with the new one.