Preact: Minor autoreconnect fixes (#2444)

play.pokemonshowdown.com/src/client-connection.ts

@@ -143,7 +143,8 @@ export class PSConnection {
 		socket.onerror = (ev: Event) => {
 			PS.connected = false;
 			PS.isOffline = true;
-			PS.alert(`Connection error: ${ev as any}`);
+			// no useful info to print from the event
+			PS.alert(`Connection error`);
 			this.retryConnection();
 			PS.update();
 		};

play.pokemonshowdown.com/src/client-main.ts

@@ -295,8 +295,14 @@ class PSPrefs extends PSStreamModel<string | null> {
 			for (let title of rooms.split(",")) {
 				PS.addRoom({ id: toID(title) as string as RoomID, title, connected: true }, true);
 			};
+			const cmd = `/autojoin ${rooms}`;
+			if (PS.connection?.queue.includes(cmd)) {
+				// don't jam up the queue with autojoin requests
+				// sending autojoin again after a prior autojoin successfully resolves likely returns an error from the server
+				return;
+			}
 			// send even if `rooms` is empty, for server autojoins
-			PS.send(`/autojoin ${rooms}`);
+			PS.send(cmd);
 		}
 	}
 }