fix multi tab presence

packages/server/src/table.ts

@@ -24,7 +24,7 @@ export type TWsIn = typeof WsIn.static;
 type Attributed = { humanKey: string };
 type TablePayload<GameState, GameAction> = {
 	inputs: {
-		presenceChanges: TBus<
+		connectionChanges: TBus<
 			Attributed & { presence: "joined" | "left" },
 			never
 		>;
@@ -45,23 +45,30 @@ const tables: {
 export const liveTable = <GameState, GameAction>(key: string) => {
 	if (!(key in tables)) {
 		const inputs: TablePayload<GameState, GameAction>["inputs"] = {
-			presenceChanges: Bus(),
+			connectionChanges: Bus(),
 			gameProposals: Bus(),
 			gameStarts: Bus(),
 			gameActions: Bus(),
 		};
-		const { presenceChanges, gameProposals, gameStarts, gameActions } =
+		const { connectionChanges, gameProposals, gameStarts, gameActions } =
 			inputs;
 
 		// =======
-		const playersPresent = presenceChanges.scan((prev, evt) => {
-			if (evt.presence == "joined") {
-				prev.push(evt.humanKey);
-			} else if (evt.presence == "left") {
-				prev.splice(prev.indexOf(evt.humanKey), 1);
+		const playerConnectionCounts = connectionChanges.scan((prev, evt) => {
+			if (evt.presence == "left" && prev[evt.humanKey] == 1) {
+				const { [evt.humanKey]: _, ...rest } = prev;
+				return rest;
 			}
-			return prev;
-		}, [] as string[]);
+			return {
+				...prev,
+				[evt.humanKey]:
+					(prev[evt.humanKey] ?? 0) +
+					(evt.presence == "joined" ? 1 : -1),
+			};
+		}, {} as { [key: string]: number });
+		const playersPresent = playerConnectionCounts.map((counts) =>
+			Object.keys(counts)
+		);
 
 		const gameState = transform(
 			null as SimpleGameState | null,