Add support for draft/event-playback

lib/client.js

@@ -13,6 +13,7 @@ const permanentCaps = [
 	"setname",
 
 	"draft/chathistory",
+	"draft/event-playback",
 
 	"soju.im/bouncer-networks",
 ];
@@ -160,6 +161,7 @@ export default class Client extends EventTarget {
 			msgBatch = this.batches.get(msg.tags["batch"]);
 			if (msgBatch) {
 				msgBatch.messages.push(msg);
+				msg.batch = msgBatch;
 			}
 		}
 

lib/irc.js

@@ -533,3 +533,14 @@ export function parseMembershipModes(str) {
 	}
 	return memberships;
 }
+
+export function findBatchByType(msg, type) {
+	var batch = msg.batch;
+	while (batch) {
+		if (batch.type === type) {
+			return batch;
+		}
+		batch = batch.parent;
+	}
+	return null;
+}