chore: end fixed zIndex should smaller than start

[zombieJ]

Summary by CodeRabbit

• Bug 修复
  • 优化了固定区域中元素的显示层级，使固定列的叠加效果更加准确和一致，从而在复杂布局下提供更直观、稳定的视觉体验。

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[coderabbitai]

Walkthrough

本次提交主要修改了 getCellFixedInfo 函数中 zIndexReverse 的计算逻辑。当 fixStart 非空时，zIndexReverse 由原先的 colStart 修改为 columns.length + colStart；当 fixEnd 非空时，值由原来的 columns.length * 2 - colEnd 改为 columns.length - colEnd。此次修改调整了固定列的层级计算方式。

Changes

文件	修改摘要
src/.../fixUtil.ts	修改 getCellFixedInfo 中 zIndexReverse 计算方式： - fixStart 分支由 colStart 变为 columns.length + colStart - fixEnd 分支由 columns.length * 2 - colEnd 变为 columns.length - colEnd

Possibly related PRs

• fix: stack case #1247: 引入新的 shadow offset 属性，与固定定位逻辑的调整直接相关。
• chore: add reverse css var #1248: 在 CellProps 接口中新增 zIndexReverse 属性，并在 Cell 组件中使用，直接关联到本次计算方式调整。

Poem

我是一只灵动的小兔子，
在代码田野中轻快跳跃，
见证变量间的奇妙变幻，
每个数字都像星辰闪耀，
固定层级跳出新节拍，
代码世界亦有诗意徜徉。

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src/utils/fixUtil.ts

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📥 Commits

Reviewing files that changed from the base of the PR and between 1f21ae4 and 059d0f3.

⛔ Files ignored due to path filters (4)

• tests/__snapshots__/ExpandRow.spec.jsx.snap is excluded by !**/*.snap
• tests/__snapshots__/FixedColumn.spec.tsx.snap is excluded by !**/*.snap
• tests/__snapshots__/Summary.spec.tsx.snap is excluded by !**/*.snap
• tests/__snapshots__/Table.spec.jsx.snap is excluded by !**/*.snap

📒 Files selected for processing (1)

• src/utils/fixUtil.ts (1 hunks)

⏰ Context from checks skipped due to timeout of 90000ms (1)

• GitHub Check: test / react component workflow

🔇 Additional comments (2)

src/utils/fixUtil.ts (2)

64-64: 优化了固定左侧列的zIndexReverse计算方式

将固定左侧列的zIndexReverse从colStart修改为columns.length + colStart，确保固定左侧列的层级高于固定右侧列。这样的修改使得左侧固定列总是会覆盖右侧固定列，与功能设计目标一致。

---

69-69: 优化了固定右侧列的zIndexReverse计算方式

将固定右侧列的zIndexReverse从columns.length * 2 - colEnd修改为columns.length - colEnd，这样确保了固定右侧列的层级始终小于固定左侧列。这与PR目标"end fixed zIndex should smaller than start"完全一致。

修改后，对于固定右侧列，其zIndexReverse值范围为1到columns.length，而固定左侧列的zIndexReverse值范围为columns.length到columns.length * 2 - 1，确保了两者不会重叠且保持了正确的层级关系。

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.03%. Comparing base (1f21ae4) to head (059d0f3).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1249   +/-   ##
=======================================
  Coverage   98.03%   98.03%           
=======================================
  Files          76       76           
  Lines        7419     7419           
  Branches     1145     1145           
=======================================
  Hits         7273     7273           
  Misses        140      140           
  Partials        6        6           

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