fix(Table): rowspanAndColspan disappear during virtual scrolling

[RylanBot]

🤔 这个 PR 的性质是？

• 日常 bug 修复
• 新特性提交
• 文档改进
• 演示代码改进
• 组件样式/交互改进
• CI/CD 改进
• 重构
• 代码风格优化
• 测试用例
• 分支合并
• 其他

🔗 相关 Issue

• [Table] 虚拟滚动问题：fix右列样式没对齐问题 + 滚到下面行的线消失了 + 合并单元格有问题 #3842
• [table] 虚拟滚动带有单元格合并的，会出现错位 tdesign-vue-next#4652

💡 需求背景和解决方案

📝 更新日志

• fix(Table): 修复虚拟滚动时，开启合并行的单元格消失的问题

• 本条 PR 不需要纳入 Changelog

☑️ 请求合并前的自查清单

⚠️ 请自检并全部勾选全部选项。⚠️

• 文档已补充或无须补充
• 代码演示已提供或无须提供
• TypeScript 定义已补充或无须补充
• Changelog 已提供或无须提供

[pkg-pr-new]

tdesign-react-demo

npm i https://pkg.pr.new/tdesign-react@3900

commit: c8e9d5f

[github-actions]

[Copilot]

Pull Request Overview

This PR fixes a bug where cells with rowspan and colspan attributes disappear during virtual scrolling in the Table component. The fix ensures that the rowspan/colspan map is calculated based on the currently visible data rather than the full dataset, and uses useIsomorphicLayoutEffect instead of useEffect to synchronize layout calculations.

Key changes:

• Updated useRowspanAndColspan hook to use useIsomorphicLayoutEffect for better synchronization with layout updates
• Changed TBody to pass renderData instead of data to ensure rowspan/colspan calculations work with virtualized data
• Added debouncing mechanism in useVirtualScroll to prevent rapid consecutive updates during scrolling

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
packages/components/table/hooks/useRowspanAndColspan.ts	Switched from useEffect to useIsomorphicLayoutEffect for layout synchronization and added type import
packages/components/table/TBody.tsx	Changed to pass renderData instead of data to fix rowspan/colspan with virtual scrolling
packages/components/hooks/useVirtualScroll.ts	Added isUpdating flag and scroll position correction logic to prevent update conflicts

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[Copilot]

The variable targetScrollTop is assigned directly from scrollTop parameter without modification. This intermediate variable adds no value and can be removed - use scrollTop directly in the setTimeout callback.

Suggested change

	const targetScrollTop = scrollTop;
	setTimeout(() => {
	const currentScrollTop = container.current?.scrollTop;
	const scrollTopDiff = Math.abs(currentScrollTop - targetScrollTop);
	if (scrollTopDiff > 0) {
	// eslint-disable-next-line no-param-reassign
	container.current.scrollTop = targetScrollTop;
	setTimeout(() => {
	const currentScrollTop = container.current?.scrollTop;
	const scrollTopDiff = Math.abs(currentScrollTop - scrollTop);
	if (scrollTopDiff > 0) {
	// eslint-disable-next-line no-param-reassign
	container.current.scrollTop = scrollTop;