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@@ -632,6 +632,33 @@ describe('ChatView', () => {
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expect(view.getByRole('button', { name: '跳转到第 3 轮' }).getAttribute('aria-current')).toBe('true')
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})
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+ it('a jump from the pinned tail releases bottom ownership so the follow snap cannot cancel it', async () => {
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+ const later = [userInTurn(8, 'third prompt', 3), assistant(9, 'third response', 3)]
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+ const h = makeHarness({ nodes: later }, { hasMore: true })
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+ h.setOutline({
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+ turns: [
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+ { turn: 1, seq: 0, prompt: 'first prompt' },
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+ { turn: 3, seq: 8, prompt: 'third prompt' },
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+ ],
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+ })
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+ let releaseJump: (() => void) | undefined
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+ h.loadThrough.mockImplementation(() => new Promise<void>((resolve) => { releaseJump = resolve }))
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+ const view = render(<h.ChatView {...h.props} />)
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+ // Pinned to the tail on open: the back-to-bottom control is absent.
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+ expect(view.queryByRole('button', { name: '回到底部' })).toBeNull()
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+
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+ const first = view.getByRole('button', { name: '加载并跳转到第 1 轮' })
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+ fireEvent.click(first)
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+ // The click itself leaves the tail...
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+ expect(view.getByRole('button', { name: '回到底部' })).toBeTruthy()
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+ // ...so a non-reader scroll delivery at the floor (the first prepend's
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+ // compensation fires one) no longer snaps to the tail and cancel the jump.
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+ const scroller = view.container.querySelector('[class*="scroll"]') as HTMLElement
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+ fireEvent.scroll(scroller)
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+ expect(first.getAttribute('aria-busy')).toBe('true')
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+ await act(async () => { releaseJump?.() })
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+ })
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+
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it('scrolls the fixed-pitch rail inside its frame with gradient fades at the scrollable ends', () => {
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const h = makeHarness(
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{ nodes: [userInTurn(8, 'latest prompt', 60), assistant(9, 'latest response', 60)] },
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Yichen Jiang