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@@ -2445,6 +2445,39 @@ describe('ChatView', () => {
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}
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})
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+ it('lets small reader movements accumulate past the follow threshold during growth', () => {
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+ let notify: (() => void) | undefined
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+ class ResizeObserverStub {
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+ constructor(callback: ResizeObserverCallback) {
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+ notify = () => { callback([], this as unknown as ResizeObserver) }
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+ }
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+
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+ observe = vi.fn()
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+ disconnect = vi.fn()
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+ }
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+ vi.stubGlobal('ResizeObserver', ResizeObserverStub)
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+ const h = makeHarness({ nodes: [user(1, 'q'), assistant(2, 'a')] })
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+ const view = render(<h.ChatView {...h.props} />)
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+ const scroller = view.container.querySelector('[class*="scroll"]') as HTMLDivElement
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+ const metrics = installScrollMetrics(scroller, 1_000, 300)
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+ expect(notify).toBeDefined()
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+ scroller.scrollTop = 700
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+ fireEvent.scroll(scroller)
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+ fireEvent(scroller, new Event('scrollend'))
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+ scroller.scrollTop = 690
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+ fireEvent.scroll(scroller)
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+ metrics.setHeight(1_020)
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+ act(() => { notify?.() })
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+ expect(scroller.scrollTop).toBe(690)
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+ scroller.scrollTop = 680
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+ fireEvent.scroll(scroller)
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+ fireEvent(scroller, new Event('scrollend'))
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+ expect(view.getByLabelText('回到底部')).toBeTruthy()
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+ metrics.setHeight(1_040)
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+ act(() => { notify?.() })
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+ expect(scroller.scrollTop).toBe(680)
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+ })
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+
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it('clears an away sample when a back-to-bottom delivery restores pinned ownership', () => {
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const h = makeHarness({ nodes: [user(1, 'q'), assistant(2, 'a')] })
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const view = render(<h.ChatView {...h.props} />)
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@@ -2476,6 +2509,7 @@ describe('ChatView', () => {
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fireEvent.scroll(scroller)
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scroller.scrollTop = 500
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fireEvent.scroll(scroller)
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+ fireEvent(scroller, new Event('scrollend'))
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expect(view.getByLabelText('回到底部')).toBeTruthy()
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const rect = vi.spyOn(HTMLElement.prototype, 'getBoundingClientRect')
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try {
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Tianyi Cui