Preserve chat scroll position across workspace switches (#2838)
* fix(app): preserve chat scroll across workspace switches Hidden retained panels can emit geometry-driven scroll events while collapsed, which previously looked like user intent and disabled output following. Keep the retained DOM mounted, suspend its inactive scroll work, and only detach from the bottom after explicit input. * fix(app): classify chat scroll intent at input A held pointer is not evidence that a geometry-driven scroll was user initiated. Detach output following directly from upward wheel, key, touch, or mouse-drag input, and keep ordinary scroll events responsible only for metrics and bottom reattachment. * fix(app): keep editing keys out of scroll intent Question inputs render inside the chat viewport, so their caret-navigation keys bubble through the same keyboard boundary. Treat keys from editable descendants as editing intent while preserving viewport-level keyboard scrolling. * fix(app): exclude zoom gestures from scroll intent Ctrl-wheel and trackpad pinch events can carry a negative wheel delta without scrolling chat content. Keep those browser zoom gestures from disabling output following. * fix(app): require pointer-driven chat movement Mouse movement alone is not viewport scroll intent. Correlate actual upward scroll with short-lived content-drag evidence or a scrollbar-gutter gesture, while excluding embedded editors and retaining geometry-only following. * fix(app): recognize overlay chat scrollbars * fix(app): scope scroll intent to chat viewport * fix(app): rearm chat history at scroll start * fix(app): track chat autoscroll intent * fix(app): separate pointer scroll gestures
This commit is contained in:
Mohamed Boudra
@@ -5,6 +5,7 @@ import React from "react";
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import { act } from "react";
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import { createRoot, type Root } from "react-dom/client";
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import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
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import { RetainedPanelActivity } from "@/components/retained-panel";
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import type { StreamItem } from "@/types/stream";
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import type { StreamRenderInput, StreamSegmentRenderers, StreamViewportHandle } from "./strategy";
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import { createWebStreamStrategy } from "./strategy-web";
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@@ -25,6 +26,10 @@ vi.hoisted(() => {
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});
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});
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vi.mock("react-native-unistyles", () => ({
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withUnistyles: (Component: React.ComponentType) => Component,
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}));
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function userMessage(index: number): StreamItem {
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return {
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kind: "user_message",
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@@ -533,6 +538,7 @@ describe("createWebStreamStrategy", () => {
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const strategy = createWebStreamStrategy({ isMobileBreakpoint: true });
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const viewportRef = React.createRef<StreamViewportHandle>();
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const historyMounted = Array.from({ length: 20 }, (_, index) => userMessage(index));
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const onNearHistoryStart = vi.fn().mockReturnValue(false);
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const routeBottomAnchorRequest = {
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agentId: "agent",
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reason: "initial-entry" as const,
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@@ -555,10 +561,10 @@ describe("createWebStreamStrategy", () => {
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viewportRef,
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routeBottomAnchorRequest,
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onNearBottomChange: vi.fn(),
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onNearHistoryStart: vi.fn().mockReturnValue(true),
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onNearHistoryStart,
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isLoadingOlderHistory: false,
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hasOlderHistory: false,
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olderHistoryProgressKey: null,
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hasOlderHistory: true,
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olderHistoryProgressKey: "epoch-1:20",
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scrollEnabled: true,
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listStyle: null,
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baseListContentContainerStyle: null,
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@@ -595,7 +601,7 @@ describe("createWebStreamStrategy", () => {
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act(() => {
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scrollContainer.dispatchEvent(new WheelEvent("wheel", { deltaY: -240 }));
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});
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Object.defineProperty(scrollContainer, "scrollTop", { configurable: true, value: 520 });
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Object.defineProperty(scrollContainer, "scrollTop", { configurable: true, value: 0 });
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act(() => {
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scrollContainer.dispatchEvent(new Event("scroll"));
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});
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@@ -611,6 +617,14 @@ describe("createWebStreamStrategy", () => {
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});
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expect(scrollTo).not.toHaveBeenCalled();
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await act(async () => Promise.resolve());
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expect(onNearHistoryStart).toHaveBeenCalledOnce();
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act(() => {
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scrollContainer.dispatchEvent(new WheelEvent("wheel", { deltaY: -240 }));
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});
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await act(async () => Promise.resolve());
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expect(onNearHistoryStart).toHaveBeenCalledTimes(2);
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});
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it("does not force bottom after upward wheel when cached scroll top is stale", async () => {
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@@ -821,4 +835,413 @@ describe("createWebStreamStrategy", () => {
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expect(scrollTo).toHaveBeenCalled();
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});
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it("keeps following output after geometry, nested-scroll, and zoom wheel events", () => {
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const scrollTo = vi.fn(function (this: HTMLElement, options?: ScrollToOptions | number) {
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const top = typeof options === "object" ? (options.top ?? 0) : 0;
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Object.defineProperty(this, "scrollTop", { configurable: true, value: top });
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});
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HTMLElement.prototype.scrollTo = scrollTo;
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const strategy = createWebStreamStrategy({ isMobileBreakpoint: true });
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const viewportRef = React.createRef<StreamViewportHandle>();
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const renderInput: StreamRenderInput = {
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agentId: "agent",
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segments: {
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historyVirtualized: [],
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historyMounted: [userMessage(1), userMessage(2)],
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liveHead: [],
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},
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boundary: {
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hasVirtualizedHistory: false,
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hasMountedHistory: true,
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hasLiveHead: false,
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},
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renderers: createRenderers(vi.fn()),
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listEmptyComponent: null,
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viewportRef,
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routeBottomAnchorRequest: null,
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isAuthoritativeHistoryReady: true,
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onNearBottomChange: vi.fn(),
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onNearHistoryStart: vi.fn().mockReturnValue(true),
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isLoadingOlderHistory: false,
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hasOlderHistory: false,
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olderHistoryProgressKey: null,
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scrollEnabled: true,
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listStyle: null,
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baseListContentContainerStyle: null,
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forwardListContentContainerStyle: null,
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};
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container = document.createElement("div");
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document.body.appendChild(container);
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root = createRoot(container);
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act(() => root?.render(strategy.render(renderInput)));
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const scrollContainer = container.querySelector('[data-testid="agent-chat-scroll"]');
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if (!(scrollContainer instanceof HTMLElement)) {
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throw new Error("Expected agent chat scroll container");
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}
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Object.defineProperty(scrollContainer, "clientHeight", { configurable: true, value: 500 });
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Object.defineProperty(scrollContainer, "clientWidth", { configurable: true, value: 500 });
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Object.defineProperty(scrollContainer, "offsetWidth", { configurable: true, value: 500 });
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Object.defineProperty(scrollContainer, "scrollHeight", { configurable: true, value: 1500 });
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Object.defineProperty(scrollContainer, "scrollTop", { configurable: true, value: 1000 });
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scrollContainer.getBoundingClientRect = () =>
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({
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bottom: 500,
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height: 500,
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left: 0,
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right: 500,
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top: 0,
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width: 500,
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x: 0,
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y: 0,
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toJSON: () => {},
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}) as DOMRect;
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act(() => scrollContainer.dispatchEvent(new Event("scroll")));
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const jitterPointerDown = new MouseEvent("pointerdown", {
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bubbles: true,
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button: 0,
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buttons: 1,
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clientX: 100,
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clientY: 400,
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});
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const jitterPointerMove = new MouseEvent("pointermove", {
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bubbles: true,
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buttons: 1,
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clientX: 100,
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clientY: 397,
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});
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for (const event of [jitterPointerDown, jitterPointerMove]) {
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Object.defineProperties(event, {
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isPrimary: { value: true },
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pointerId: { value: 1 },
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pointerType: { value: "mouse" },
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});
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}
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act(() => {
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scrollContainer.dispatchEvent(jitterPointerDown);
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window.dispatchEvent(jitterPointerMove);
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});
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Object.defineProperty(scrollContainer, "clientHeight", { configurable: true, value: 700 });
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Object.defineProperty(scrollContainer, "scrollTop", { configurable: true, value: 800 });
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act(() => scrollContainer.dispatchEvent(new Event("scroll")));
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scrollTo.mockClear();
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const nestedScroller = document.createElement("div");
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nestedScroller.style.overflowY = "auto";
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Object.defineProperty(nestedScroller, "clientHeight", { configurable: true, value: 100 });
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Object.defineProperty(nestedScroller, "scrollHeight", { configurable: true, value: 300 });
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Object.defineProperty(nestedScroller, "scrollTop", { configurable: true, value: 100 });
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scrollContainer.append(nestedScroller);
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act(() => {
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nestedScroller.dispatchEvent(new WheelEvent("wheel", { bubbles: true, deltaY: -100 }));
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Object.defineProperty(scrollContainer, "scrollTop", { configurable: true, value: 700 });
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scrollContainer.dispatchEvent(new Event("scroll"));
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scrollContainer.dispatchEvent(
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new WheelEvent("wheel", { bubbles: true, ctrlKey: true, deltaY: -100 }),
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);
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});
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Object.defineProperty(scrollContainer, "scrollHeight", { configurable: true, value: 1800 });
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act(() => {
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root?.render(
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strategy.render({
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...renderInput,
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segments: { ...renderInput.segments, liveHead: [userMessage(3)] },
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boundary: { ...renderInput.boundary, hasLiveHead: true },
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}),
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);
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});
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expect(scrollTo).toHaveBeenCalledWith({ top: 1800, behavior: "auto" });
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});
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it("stops following output after scrollbar and middle-button upward scrolling", () => {
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const scrollTo = vi.fn(function (this: HTMLElement, options?: ScrollToOptions | number) {
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const top = typeof options === "object" ? (options.top ?? 0) : 0;
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Object.defineProperty(this, "scrollTop", { configurable: true, value: top });
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});
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HTMLElement.prototype.scrollTo = scrollTo;
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const strategy = createWebStreamStrategy({ isMobileBreakpoint: true });
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const renderInput: StreamRenderInput = {
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agentId: "agent",
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segments: {
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historyVirtualized: [],
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historyMounted: [userMessage(1), userMessage(2)],
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liveHead: [],
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},
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boundary: {
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hasVirtualizedHistory: false,
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hasMountedHistory: true,
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hasLiveHead: false,
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},
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renderers: createRenderers(vi.fn()),
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listEmptyComponent: null,
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viewportRef: React.createRef<StreamViewportHandle>(),
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routeBottomAnchorRequest: null,
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isAuthoritativeHistoryReady: true,
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onNearBottomChange: vi.fn(),
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onNearHistoryStart: vi.fn().mockReturnValue(true),
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isLoadingOlderHistory: false,
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hasOlderHistory: false,
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olderHistoryProgressKey: null,
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scrollEnabled: true,
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listStyle: null,
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baseListContentContainerStyle: null,
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forwardListContentContainerStyle: null,
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};
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container = document.createElement("div");
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document.body.appendChild(container);
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root = createRoot(container);
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act(() => root?.render(strategy.render(renderInput)));
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const scrollContainer = container.querySelector('[data-testid="agent-chat-scroll"]');
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if (!(scrollContainer instanceof HTMLElement)) {
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throw new Error("Expected agent chat scroll container");
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}
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Object.defineProperty(scrollContainer, "clientHeight", { configurable: true, value: 500 });
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Object.defineProperty(scrollContainer, "clientWidth", { configurable: true, value: 500 });
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Object.defineProperty(scrollContainer, "offsetWidth", { configurable: true, value: 520 });
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Object.defineProperty(scrollContainer, "scrollHeight", { configurable: true, value: 1500 });
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Object.defineProperty(scrollContainer, "scrollTop", { configurable: true, value: 1000 });
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scrollContainer.getBoundingClientRect = () =>
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({
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bottom: 500,
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height: 500,
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left: 0,
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right: 520,
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top: 0,
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width: 520,
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x: 0,
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y: 0,
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toJSON: () => {},
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}) as DOMRect;
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act(() => scrollContainer.dispatchEvent(new Event("scroll")));
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const scrollbarPointerDown = new MouseEvent("pointerdown", {
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bubbles: true,
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button: 0,
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buttons: 1,
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clientX: 515,
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clientY: 400,
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});
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Object.defineProperties(scrollbarPointerDown, {
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isPrimary: { value: true },
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pointerId: { value: 1 },
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pointerType: { value: "mouse" },
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});
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act(() => scrollContainer.dispatchEvent(scrollbarPointerDown));
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Object.defineProperty(scrollContainer, "scrollTop", { configurable: true, value: 700 });
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act(() => scrollContainer.dispatchEvent(new Event("scroll")));
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scrollTo.mockClear();
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Object.defineProperty(scrollContainer, "scrollHeight", { configurable: true, value: 1800 });
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act(() => {
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root?.render(
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strategy.render({
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...renderInput,
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segments: { ...renderInput.segments, liveHead: [userMessage(3)] },
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boundary: { ...renderInput.boundary, hasLiveHead: true },
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}),
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);
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});
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expect(scrollTo).not.toHaveBeenCalled();
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Object.defineProperty(scrollContainer, "scrollTop", { configurable: true, value: 1300 });
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act(() => scrollContainer.dispatchEvent(new Event("scroll")));
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Object.defineProperty(scrollContainer, "offsetWidth", { configurable: true, value: 500 });
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scrollContainer.getBoundingClientRect = () =>
|
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({
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bottom: 500,
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height: 500,
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left: 0,
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right: 500,
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top: 0,
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width: 500,
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x: 0,
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y: 0,
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toJSON: () => {},
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}) as DOMRect;
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const overlayScrollbarPointerDown = new MouseEvent("pointerdown", {
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bubbles: true,
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button: 0,
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buttons: 1,
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clientX: 495,
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clientY: 400,
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});
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Object.defineProperties(overlayScrollbarPointerDown, {
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isPrimary: { value: true },
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pointerId: { value: 2 },
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pointerType: { value: "mouse" },
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});
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act(() => scrollContainer.dispatchEvent(overlayScrollbarPointerDown));
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Object.defineProperty(scrollContainer, "scrollTop", { configurable: true, value: 900 });
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act(() => scrollContainer.dispatchEvent(new Event("scroll")));
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scrollTo.mockClear();
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Object.defineProperty(scrollContainer, "scrollHeight", { configurable: true, value: 1900 });
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act(() => {
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root?.render(
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strategy.render({
|
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...renderInput,
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segments: {
|
||||
...renderInput.segments,
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liveHead: [userMessage(3), userMessage(4)],
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},
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boundary: { ...renderInput.boundary, hasLiveHead: true },
|
||||
}),
|
||||
);
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});
|
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expect(scrollTo).not.toHaveBeenCalled();
|
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|
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Object.defineProperty(scrollContainer, "scrollTop", { configurable: true, value: 1400 });
|
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act(() => scrollContainer.dispatchEvent(new Event("scroll")));
|
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const autoscrollPointerDown = new MouseEvent("pointerdown", {
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bubbles: true,
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button: 1,
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buttons: 4,
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clientX: 100,
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clientY: 400,
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||||
});
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const autoscrollPointerUp = new MouseEvent("pointerup", {
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bubbles: true,
|
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button: 1,
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buttons: 0,
|
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clientX: 100,
|
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clientY: 400,
|
||||
});
|
||||
const autoscrollPointerMove = new MouseEvent("pointermove", {
|
||||
bubbles: true,
|
||||
buttons: 0,
|
||||
clientX: 100,
|
||||
clientY: 300,
|
||||
});
|
||||
for (const event of [autoscrollPointerDown, autoscrollPointerUp, autoscrollPointerMove]) {
|
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Object.defineProperties(event, {
|
||||
isPrimary: { value: true },
|
||||
pointerId: { value: 3 },
|
||||
pointerType: { value: "mouse" },
|
||||
});
|
||||
}
|
||||
act(() => {
|
||||
scrollContainer.dispatchEvent(autoscrollPointerDown);
|
||||
window.dispatchEvent(autoscrollPointerUp);
|
||||
window.dispatchEvent(autoscrollPointerMove);
|
||||
});
|
||||
Object.defineProperty(scrollContainer, "scrollTop", { configurable: true, value: 1000 });
|
||||
act(() => scrollContainer.dispatchEvent(new Event("scroll")));
|
||||
scrollTo.mockClear();
|
||||
|
||||
Object.defineProperty(scrollContainer, "scrollHeight", { configurable: true, value: 2000 });
|
||||
act(() => {
|
||||
root?.render(
|
||||
strategy.render({
|
||||
...renderInput,
|
||||
segments: {
|
||||
...renderInput.segments,
|
||||
liveHead: [userMessage(3), userMessage(4), userMessage(5)],
|
||||
},
|
||||
boundary: { ...renderInput.boundary, hasLiveHead: true },
|
||||
}),
|
||||
);
|
||||
});
|
||||
expect(scrollTo).not.toHaveBeenCalled();
|
||||
});
|
||||
|
||||
it("keeps the retained viewport mounted while inactive and reconciles it once on return", () => {
|
||||
const observed = new Map<Element, ReturnType<typeof vi.fn>>();
|
||||
Object.defineProperty(globalThis, "ResizeObserver", {
|
||||
configurable: true,
|
||||
value: class ResizeObserver {
|
||||
readonly disconnect = vi.fn();
|
||||
|
||||
observe(target: Element) {
|
||||
observed.set(target, this.disconnect);
|
||||
}
|
||||
},
|
||||
});
|
||||
const scrollTo = vi.fn(function (this: HTMLElement, options?: ScrollToOptions | number) {
|
||||
const top = typeof options === "object" ? (options.top ?? 0) : 0;
|
||||
Object.defineProperty(this, "scrollTop", { configurable: true, value: top });
|
||||
});
|
||||
HTMLElement.prototype.scrollTo = scrollTo;
|
||||
const strategy = createWebStreamStrategy({ isMobileBreakpoint: true });
|
||||
const viewportRef = React.createRef<StreamViewportHandle>();
|
||||
const renderInput: StreamRenderInput = {
|
||||
agentId: "agent",
|
||||
segments: {
|
||||
historyVirtualized: [],
|
||||
historyMounted: [userMessage(1), userMessage(2)],
|
||||
liveHead: [],
|
||||
},
|
||||
boundary: {
|
||||
hasVirtualizedHistory: false,
|
||||
hasMountedHistory: true,
|
||||
hasLiveHead: false,
|
||||
},
|
||||
renderers: createRenderers(vi.fn()),
|
||||
listEmptyComponent: null,
|
||||
viewportRef,
|
||||
routeBottomAnchorRequest: null,
|
||||
isAuthoritativeHistoryReady: true,
|
||||
onNearBottomChange: vi.fn(),
|
||||
onNearHistoryStart: vi.fn().mockReturnValue(true),
|
||||
isLoadingOlderHistory: false,
|
||||
hasOlderHistory: false,
|
||||
olderHistoryProgressKey: null,
|
||||
scrollEnabled: true,
|
||||
listStyle: null,
|
||||
baseListContentContainerStyle: null,
|
||||
forwardListContentContainerStyle: null,
|
||||
};
|
||||
const renderWithActivity = (active: boolean, input: StreamRenderInput = renderInput) => (
|
||||
<RetainedPanelActivity active={active}>{strategy.render(input)}</RetainedPanelActivity>
|
||||
);
|
||||
container = document.createElement("div");
|
||||
document.body.appendChild(container);
|
||||
root = createRoot(container);
|
||||
|
||||
act(() => root?.render(renderWithActivity(true)));
|
||||
const scrollContainer = container.querySelector('[data-testid="agent-chat-scroll"]');
|
||||
if (!(scrollContainer instanceof HTMLElement)) {
|
||||
throw new Error("Expected agent chat scroll container");
|
||||
}
|
||||
Object.defineProperty(scrollContainer, "clientHeight", { configurable: true, value: 500 });
|
||||
Object.defineProperty(scrollContainer, "scrollHeight", { configurable: true, value: 1500 });
|
||||
Object.defineProperty(scrollContainer, "scrollTop", { configurable: true, value: 1000 });
|
||||
act(() => scrollContainer.dispatchEvent(new Event("scroll")));
|
||||
const viewportObserverDisconnect = observed.get(scrollContainer);
|
||||
expect(viewportObserverDisconnect).toBeDefined();
|
||||
|
||||
act(() => root?.render(renderWithActivity(false)));
|
||||
expect(container.querySelector('[data-testid="agent-chat-scroll"]')).toBe(scrollContainer);
|
||||
expect(viewportObserverDisconnect).toHaveBeenCalledOnce();
|
||||
scrollTo.mockClear();
|
||||
Object.defineProperty(scrollContainer, "scrollHeight", { configurable: true, value: 2200 });
|
||||
Object.defineProperty(scrollContainer, "scrollTop", { configurable: true, value: 0 });
|
||||
act(() => {
|
||||
scrollContainer.dispatchEvent(new WheelEvent("wheel", { deltaY: -100 }));
|
||||
scrollContainer.dispatchEvent(new Event("scroll"));
|
||||
root?.render(
|
||||
renderWithActivity(false, {
|
||||
...renderInput,
|
||||
segments: { ...renderInput.segments, liveHead: [userMessage(3)] },
|
||||
boundary: { ...renderInput.boundary, hasLiveHead: true },
|
||||
}),
|
||||
);
|
||||
});
|
||||
expect(scrollTo).not.toHaveBeenCalled();
|
||||
|
||||
act(() => {
|
||||
root?.render(
|
||||
renderWithActivity(true, {
|
||||
...renderInput,
|
||||
segments: { ...renderInput.segments, liveHead: [userMessage(3)] },
|
||||
boundary: { ...renderInput.boundary, hasLiveHead: true },
|
||||
}),
|
||||
);
|
||||
});
|
||||
expect(container.querySelector('[data-testid="agent-chat-scroll"]')).toBe(scrollContainer);
|
||||
expect(scrollTo).toHaveBeenCalledWith({ top: 2200, behavior: "auto" });
|
||||
});
|
||||
});
|
||||
|
||||
Reference in New Issue
Block a user