fix(frontend/kanban): honor server bucket redirect when dropping a recurring task on Done

frontend/src/components/project/views/ProjectKanban.vue

@@ -624,10 +624,10 @@ async function updateTaskPosition(e) {
 				projectId: projectIdWithFallback.value,
 			}))
 			Object.assign(newTask, updatedTaskBucket.task)
-			newTask.bucketId = updatedTaskBucket.bucketId
 			if (updatedTaskBucket.bucketId !== newTask.bucketId) {
 				kanbanStore.moveTaskToBucket(newTask, updatedTaskBucket.bucketId)
 			}
+			newTask.bucketId = updatedTaskBucket.bucketId
 			if (updatedTaskBucket.bucket) {
 				kanbanStore.setBucketById(updatedTaskBucket.bucket, false)
 			}

frontend/src/stores/kanban.test.ts

@@ -0,0 +1,93 @@
+import {beforeEach, describe, expect, it, vi} from 'vitest'
+import {createPinia, setActivePinia} from 'pinia'
+
+vi.mock('vue-router', () => ({
+	useRouter: () => ({push: vi.fn()}),
+}))
+
+vi.mock('vue-i18n', () => ({
+	useI18n: () => ({t: (key: string) => key}),
+	createI18n: () => ({global: {t: (key: string) => key}}),
+}))
+
+vi.mock('@/stores/base', () => ({
+	useBaseStore: () => ({
+		currentProject: null,
+		setCurrentProject: vi.fn(),
+	}),
+}))
+
+vi.mock('@/stores/auth', () => ({
+	useAuthStore: () => ({
+		authUser: true,
+		info: null,
+	}),
+}))
+
+import {useKanbanStore} from './kanban'
+
+import type {IBucket} from '@/modelTypes/IBucket'
+import type {ITask} from '@/modelTypes/ITask'
+
+function makeBucket(id: number, title: string, tasks: ITask[] = []): IBucket {
+	return {
+		id,
+		title,
+		projectViewId: 1,
+		tasks,
+		count: tasks.length,
+	} as IBucket
+}
+
+function makeTask(id: number, bucketId: number): ITask {
+	return {
+		id,
+		title: `Task ${id}`,
+		bucketId,
+	} as ITask
+}
+
+describe('kanban store: moveTaskToBucket', () => {
+	beforeEach(() => {
+		setActivePinia(createPinia())
+	})
+
+	it('relocates a task from its current bucket into the target bucket', () => {
+		const kanban = useKanbanStore()
+		kanban.setBuckets([makeBucket(1, 'To-Do'), makeBucket(2, 'Done')])
+
+		const task = makeTask(42, 2)
+		kanban.addTaskToBucket(task)
+		expect(kanban.buckets[1].tasks.map(t => t.id)).toEqual([42])
+
+		kanban.moveTaskToBucket(task, 1)
+
+		expect(kanban.buckets[0].tasks.map(t => t.id)).toEqual([42])
+		expect(kanban.buckets[0].tasks[0].bucketId).toBe(1)
+		expect(kanban.buckets[1].tasks.map(t => t.id)).toEqual([])
+	})
+
+	it('is a no-op when the task is already in the target bucket', () => {
+		const kanban = useKanbanStore()
+		kanban.setBuckets([makeBucket(1, 'To-Do'), makeBucket(2, 'Done')])
+
+		const task = makeTask(42, 1)
+		kanban.addTaskToBucket(task)
+
+		kanban.moveTaskToBucket(task, 1)
+
+		expect(kanban.buckets[0].tasks.map(t => t.id)).toEqual([42])
+		expect(kanban.buckets[1].tasks.map(t => t.id)).toEqual([])
+	})
+
+	it('is a no-op when the task is not present in any bucket', () => {
+		const kanban = useKanbanStore()
+		kanban.setBuckets([makeBucket(1, 'To-Do'), makeBucket(2, 'Done')])
+
+		const strayTask = makeTask(99, 2)
+		kanban.moveTaskToBucket(strayTask, 1)
+
+		expect(kanban.buckets[0].tasks).toEqual([])
+		expect(kanban.buckets[1].tasks).toEqual([])
+	})
+})

frontend/tests/e2e/project/project-view-kanban.spec.ts

@@ -144,6 +144,49 @@ test.describe('Project View Kanban', () => {
 		await expect(page.locator('.kanban .bucket:nth-child(1) .tasks')).not.toContainText(tasks[0].title)
 	})
 
+	test('Recurring task dropped on done bucket moves back to the default bucket', async ({authenticatedPage: page}) => {
+		// Reproduces https://github.com/go-vikunja/vikunja/issues/2618
+		const projects = await ProjectFactory.create(1)
+		await ProjectViewFactory.create(1, {
+			id: 10,
+			project_id: projects[0].id,
+			view_kind: 3,
+			bucket_configuration_mode: 1,
+			done_bucket_id: 2,
+		})
+		const localBuckets = await BucketFactory.create(2, {
+			id: '{increment}',
+			project_view_id: 10,
+		})
+
+		const tomorrow = new Date()
+		tomorrow.setDate(tomorrow.getDate() + 1)
+		const tasks = await TaskFactory.create(1, {
+			id: 100,
+			project_id: projects[0].id,
+			title: 'Recurring Task',
+			repeat_after: 604800,
+			repeat_mode: 2,
+			due_date: tomorrow.toISOString(),
+		})
+		await TaskBucketFactory.create(1, {
+			task_id: tasks[0].id,
+			bucket_id: localBuckets[0].id,
+			project_view_id: 10,
+		})
+
+		await page.goto(`/projects/${projects[0].id}/10`)
+
+		const sourceTask = page.locator('.kanban .bucket .tasks .task').filter({hasText: tasks[0].title}).first()
+		const doneBucket = page.locator('.kanban .bucket:nth-child(2) .tasks')
+		await sourceTask.dragTo(doneBucket)
+
+		// After the drop, the backend's recurrence redirect must be honored in the UI:
+		// the card appears back in the first (default/backlog) bucket with no refresh.
+		await expect(page.locator('.kanban .bucket:nth-child(1) .tasks')).toContainText(tasks[0].title)
+		await expect(page.locator('.kanban .bucket:nth-child(2) .tasks')).not.toContainText(tasks[0].title)
+	})
+
 	test('Should navigate to the task when the task card is clicked', async ({authenticatedPage: page}) => {
 		const tasks = await createTaskWithBuckets(buckets, 5)
 		await page.goto('/projects/1/4')