fix: support concurrent game windows and prepare beta12 GitHub releases

apps/app-frontend/src/helpers/instance-launch-state.test.ts

@@ -0,0 +1,38 @@
+import assert from 'node:assert/strict'
+import { test } from 'node:test'
+import { isInstanceLaunching, launchOnce } from './instance-launch-state.ts'
+
+test('launches different instances concurrently and coalesces repeated pending clicks', async () => {
+	let finishA!: (value: string) => void
+	let starts = 0
+	const first = launchOnce('a', () => {
+		starts++
+		return new Promise<string>((resolve) => {
+			finishA = resolve
+		})
+	})
+	assert.equal(
+		launchOnce('a', async () => 'unexpected duplicate'),
+		first,
+	)
+	assert.equal(isInstanceLaunching('a'), true)
+	assert.equal(isInstanceLaunching('b'), false)
+	assert.equal(await launchOnce('b', async () => 'b started'), 'b started')
+	assert.equal(isInstanceLaunching('a'), true)
+	finishA('a started')
+	assert.equal(await first, 'a started')
+	assert.equal(starts, 1)
+	assert.equal(isInstanceLaunching('a'), false)
+	assert.equal(await launchOnce('a', async () => 'second window'), 'second window')
+})
+
+test('failed launch releases only its own pending state and can retry', async () => {
+	await assert.rejects(
+		launchOnce('failed', async () => {
+			throw new Error('launch failed')
+		}),
+		/launch failed/,
+	)
+	assert.equal(isInstanceLaunching('failed'), false)
+	assert.equal(await launchOnce('failed', async () => 'retry'), 'retry')
+})

apps/app-frontend/src/helpers/instance-launch-state.ts

@@ -0,0 +1,20 @@
+import { reactive } from 'vue'
+
+const pending = reactive(new Map<string, Promise<unknown>>())
+
+export function isInstanceLaunching(instanceId: string) {
+	return pending.has(instanceId)
+}
+
+/** Coalesce repeated clicks for one launch without blocking other instances. */
+export function launchOnce<T>(instanceId: string, launch: () => Promise<T>): Promise<T> {
+	const existing = pending.get(instanceId)
+	if (existing) return existing as Promise<T>
+	const task = Promise.resolve()
+		.then(launch)
+		.finally(() => {
+			pending.delete(instanceId)
+		})
+	pending.set(instanceId, task)
+	return task
+}

apps/app-frontend/src/helpers/instance.ts

@@ -19,6 +19,7 @@ import type { GcContext, ResolvedGcStrategyId } from '@/helpers/gc/types'
 import { setLastGcLaunchReport } from '@/helpers/gc-notice'
 import { getInstanceMode, prepareHostedSession } from '@/helpers/hosted-packs'
 import { prepareInstancePlayer } from '@/helpers/instance-player'
+import { launchOnce } from '@/helpers/instance-launch-state'
 import { AUTO_GC_PRESET_ARG } from '@/helpers/java-arguments'
 import { get_jre, get_memory_status } from '@/helpers/jre.js'
 import { get as getSettings } from '@/helpers/settings'
@@ -1071,12 +1072,19 @@ export async function resolveGcLaunchIntent(
 
 // Run Minecraft using an instance
 // Returns the process metadata plus an optional GC fallback report.
-export async function run(
+export function run(
 	instanceId: string,
 	serverAddress: string | null = null,
+): Promise<InstanceRunResult> {
+	return launchOnce(instanceId, () => launchInstance(instanceId, serverAddress))
+}
+
+async function launchInstance(
+	instanceId: string,
+	serverAddress: string | null,
 ): Promise<InstanceRunResult> {
 	await prepareInstancePlayer(instanceId)
-	if (await getInstanceMode(instanceId) === 'starlight') await prepareHostedSession()
+	if ((await getInstanceMode(instanceId)) === 'starlight') await prepareHostedSession()
 	const { args, gcIntent } = await resolveGcLaunchIntent(instanceId)
 	const result = await invoke<InstanceRunResult>('plugin:instance|instance_run', {
 		instanceId,