anchorTo: 'end' loses the end when the scroll element shrinks
维护者通常 1 天内回复
评估
- 难度
- 3/5
- 预计耗时
- 1-2 天
- 新手友好度
- 68/100
- Issue 类型
- 缺陷
- 描述清晰度
- 描述清楚
- 活跃度
- 活跃
- 技术栈
- typescript
- 领域
- frontend
调研方向
Start in packages/virtual-core where anchorTo: 'end' scroll adjustments and the resize handling live, and compare how an item growing is compensated versus how scroll-element size changes are handled. Reproduce using the chat e2e page in packages/react-virtual/e2e/app/chat/main.tsx on branch langleyd/virtual:fix/end-anchor-scroll-element-resize, which has a control that shrinks the container. Done means an end-pinned viewport stays pinned after the container shrinks, verified by the existing e2e suite plus a new case for container resize.
由索引模型根据 Issue 内容生成。
描述
Describe the bug
With anchorTo: 'end', a viewport pinned to the end stays pinned when the last item grows, but not when the scroll element itself gets shorter, for example when the window is resized or the app changes the element's height. The browser keeps scrollTop, so the newest items end up below the fold by the amount the element shrank.
In a chat application this be an element being displayed on the page(say a banner above or below the scroll element) that causes the scroll element to shrink. The effect being the users losing the their place and not seeing the most recent message.
Your minimal, reproducible example
The chat e2e page on langleyd/virtual, branch fix/end-anchor-scroll-element-resize, has a control that shrinks the scroll container: packages/react-virtual/e2e/app/chat/main.tsx.
Steps to reproduce
- Render an end-anchored list and scroll to the end.
- Reduce the scroll element's height, or resize the window when it is sized from the viewport.
- The last items are now below the fold.
Expected behavior
An end-pinned viewport stays pinned to the end, as it does when an item grows.
How often does this bug happen?
Every time
Screenshots or Videos
Currently
https://github.com/user-attachments/assets/d420fad5-7bef-426e-9d10-f72125c80fbf
Expected
https://github.com/user-attachments/assets/58152695-83aa-4da8-9e49-12c422de0499
Platform
any browser. Seen in Chrome on macOS.
tanstack-virtual version
3.17.11
TypeScript version
No response
Additional context
No response
Terms & Code of Conduct
- I agree to follow this project's Code of Conduct
- I understand that if my bug cannot be reliable reproduced in a debuggable environment, it will probably not be fixed and this issue may even be closed.
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