Conversation
resizeItem 的 wasAtEnd 此前用 getVirtualDistanceFromEnd()（列表局部坐标）判 "在末端"。宿主在虚拟列表下方还渲染了 18px shell padding 与 194px 底部占位， 列表末端离真实 clamp 约 212px，于是脱离跟随、停在距底 220px 内的读者都被 当成"在末端"，任何底部行尺寸变化都经 applyScrollAdjustment 直写 scrollTop： AskUserQuestion 卡片到达视觉位移 305px，审批请求 63px，末行流式增高 302px。 改用 getDistanceFromEnd()（DOM scrollHeight 口径，与 _willUpdate 里 followOnAppend 的 isAtEnd 一致）并加 scrollElement 判空；删除不再使用的私有 getVirtualDistanceFromEnd，types 同步并为 scrollEndThreshold 补口径说明。 测试：harness 新增 extraScrollHeight / maxScrollOffset 模拟列表下方的非虚拟 高度；end-anchor-distance 4 例覆盖带内不写、带边不写、真实 clamp 仍钉底、 默认 harness 语义不变。 Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>
主转写区的 useScrollFollow 沿用默认 192px 回贴区：滚轮下行进入该区间的那一 tick 直接 pin 到底，读者看到正文突然上跳（复现页实测单 tick 231px）。改为 reattachZonePx: 0，只在真正到达底部（8px 容差）时恢复跟随；到达底部后向下 滚轮、手势落底、指针在底部释放仍会重新贴底。 工作台背景 Pane 原本手写一套贴底：距底不足 48px 即视为跟随，行数或 revision 一变就写 scrollTop，读者停在底部附近会被每次流式增量吸回，且与主 Pane、 桌面端各 Pane 的引擎语义不一致。换成同一 useScrollFollow（zone 0，会话切换 stickToBottom），ScrollArea 根与视口经 callback ref 接入，删除三处 scrollTop 写入。 新增 transcript-scroll-follow-contract 源码契约测试锁住两处配置。 Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>
scroll-follow-probe.html 挂真实 ScrollArea + GatewayTranscript + useScrollFollow， 拦截 scrollTop/scrollTo 写入并按调用栈归因（follow-engine / virtualizer / base-ui），用视口顶部那一行的屏幕位移衡量肉眼可见的跳动；?zone= 试回贴区， ?ask=1|2 与 ?approval=1|2 构造挂起的询问卡片与审批请求。 scroll-follow-probe.cdp.mjs 用 Node 内建 WebSocket 直连无头 Chromium 的 CDP， 逐 tick 发滚轮事件记录每步位移与写入方；scroll-follow-probe.eval.mjs 对已 打开的页面即时求值。 Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>
桌面端 ChatTranscript 的 useScrollFollow 显式传 reattachZonePx: BOTTOM_REATTACH_ZONE_PX， 滚轮下行进入距底 192px 的那一 tick 直接 pin 到底，从本分支起的开发版上仍能看到 "快到最新回复结尾时上跳一下"。与 WebUI 同口径改为 0：只在真正到达底部（8px 容差） 时恢复跟随，到达底部后向下滚轮、手势落底、指针在底部释放仍会重新贴底。 BOTTOM_REATTACH_ZONE_PX 保留：它仍是桌面端底部预留带与 WebUI spacer 的最小值， scrollFollowCore 的注释改写为现状说明。chat-transcript-scroller 契约测试新增一例 锁住零回贴区配置与预留带取值。 Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>
StackCairn
marked this pull request as draft
September 20, 2026 06:36
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PR governance checks passed. Awaiting human review. |
AlphaCatMeow
marked this pull request as ready for review
September 20, 2026 08:07
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Linked issue
Closes #811
Summary
WebUI 对话区在接近底部时正文会突然上跳，触发询问用户卡片或工具审批请求时更明显。三处原因，本 PR 逐一处理：
reattachZonePx: 0，只在真正到达底部时恢复跟随；到达底部后向下滚轮、手势落底、指针在底部释放三条路径仍会重新贴底。virtual-core的wasAtEnd用列表局部距离判"在末端"，不含转写 shell 的 18px 顶部 padding 与 194px 底部占位，于是距真实 clamp 约 220px 内都算"在末端"，脱离跟随的读者会被任何底部行增高拖走（询问卡片到达 305px、审批请求 63px、流式增高 302px）。改为按 DOM 的getDistanceFromEnd()判定，与followOnAppend已用的口径一致；两端共用该 fork，桌面端同样受益。Change scope
crates/agent-gateway/web/src/app/GatewayApp.tsxcrates/agent-gateway/web/src/app/workbench/GatewayConversationPaneHost.tsxcrates/agent-gui/src/pages/chat/transcript/ChatTranscript.tsx、crates/agent-ui/src/lib/chat-scroll/scrollFollowCore.ts（注释）crates/virtual-core/src/index.ts、crates/virtual-core/types/index.d.tscrates/virtual-core/test/end-anchor-distance.test.mjs（harness 新增extraScrollHeight/maxScrollOffset）、crates/agent-gateway/web/test/transcript-scroll-follow-contract.test.mjs、crates/agent-gui/test/chat/chat-transcript-scroller.test.mjs（新增 1 例）crates/agent-gateway/web/test/browser/scroll-follow-probe.{html,cdp.mjs,eval.mjs}Screenshots / preview
Verification（在 develop 基线上重新跑）
pnpm typecheck:virtual-core通过；pnpm test:virtual-core34/34crates/agent-gateway/web：tsc --noEmit通过；pnpm test:webui720/720crates/agent-gui：tsc --noEmit通过；chat-transcript-scroller5/5、scroll-follow-core+use-scroll-follow-native-scrollbar34/34pnpm exec vite --port 5173+msedge --headless=new --remote-debugging-port=9333，node test/browser/scroll-follow-probe.cdp.mjs all|arrive|approve|askDepends-On: none
Stack-Root: #812
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