[Sunnychh]

Closes #1027.

With fractional CSS zoom and an intrinsic-width parent, the nav/list can fall back to integer layout offsets while the smaller tabs still use scaled DOMRect values. This can incorrectly hide the last tab. Showing More then grows the container, hides More again, and causes continuous width and height oscillation.

Propagate the nav/list's layout-coordinate fallback through the same measurement pass, including tab positions, extra content, the add button, and operations. Check both axes so vertical scaling also uses layout coordinates. Unscaled layouts retain fractional DOMRect precision, and independently transformed children retain their existing local fallback.

Regression coverage includes horizontal, RTL, and vertical layouts, genuinely overflowing tabs that remain selectable through More, and unscaled fractional tab sizes. The existing decimal-size test now supplies realistic parent rectangles while retaining its fractional indicator assertion.

Validation:

• npm test -- --coverage --runInBand: 6 suites, 120 tests, and 3 snapshots passed. The unchanged upstream source fails four of the new regression cases.
• npm run tsc, npm run compile, and Prettier checks passed. npm run lint passed with 0 errors and 16 warnings.
• Browser comparison against the unchanged upstream source: the issue's reproduction toggled More 118 times in 120 animation frames before the fix, and zero times after it.
• Fixed browser checks passed for the intrinsic-width reproduction, normal zoom, independent width, and selecting the last tab from More at a narrow width.

Summary by CodeRabbit

• 问题修复
  • 修复页面或祖先元素缩放时标签尺寸判断不准确的问题，避免未溢出的标签被隐藏。
  • 修复水平、从右向左及垂直标签栏在缩放布局下的溢出表现；实际溢出的标签仍可通过下拉菜单访问并选择。
  • 保留未缩放布局中的小数尺寸显示及指示条位置。

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Walkthrough

标签栏尺寸测量现在会根据容器或列表是否缩放，统一选择 DOM 矩形或 offset 坐标。新增测试覆盖水平、RTL 和垂直布局，并验证缩放溢出、菜单选择及未缩放时的小数尺寸。

Changes

标签栏尺寸测量

层 / 文件	摘要
统一测量方式与布局验证 src/TabNavList/index.tsx, tests/overflow.test.tsx	新增基于宽、高差值的缩放判定。缩放时，尺寸测量统一使用 offset 坐标；未缩放时保留 DOM 矩形测量。调整大小处理将测量方式传给容器、按钮、操作区、列表和标签更新。测试覆盖多种布局下的溢出行为及小数尺寸。

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix · Severity of issue fixed: Medium

Suggested reviewers: emilyyyliu

Merge Risk: Minimal · up to a6e7e

The zoom measurement change is ready to merge after normal checks; no concrete blocking issue remains.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documenta…	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		标题“fix: stabilize tab overflow measurements under scaling”与变更内容相符。变更修正了缩放（CSS zoom）下标签溢出测量不稳定的问题：getTabSize 与 getSize 新增 forceOffset 参数，新增 isScaled 判定，并在 onListHolderResize 中统一使用缩放判定结果。测试文件新增水平、RTL 和垂…
Linked Issues check		[#1027] 需求：在 zoom 1.01 的 intrinsic-width 容器中，More 不应反复显示和隐藏，布局应稳定。 已在 head 的 src/TabNavList/index.tsx 中核对以下实现： - isScaled 以宽或高与 offset 尺寸的差值绝对值是否至少为 1 判定缩放。 - getTabSize 和 getSize 新增 `forceOffs…
Out of Scope Changes check		变更范围集中于两处：src/TabNavList/index.tsx 的测量逻辑，以及 tests/overflow.test.tsx 的回归测试。 - 测量逻辑修改直接对应 [#1027] 的根因。新增的 forceOffset、isScaled 和 shouldUseOffset 都用于在缩放布局中统一坐标系。 - 未缩放的小数尺寸仍使用 getBoundingClientRec…

Full details: Title check

Explanation

标题“fix: stabilize tab overflow measurements under scaling”与变更内容相符。变更修正了缩放（CSS zoom）下标签溢出测量不稳定的问题：getTabSize 与 getSize 新增 forceOffset 参数，新增 isScaled 判定，并在 onListHolderResize 中统一使用缩放判定结果。测试文件新增水平、RTL 和垂直布局下的缩放回归测试。标题简短，指出了主要变更。

Full details: Linked Issues check

Explanation

[#1027] 需求：在 zoom 1.01 的 intrinsic-width 容器中，More 不应反复显示和隐藏，布局应稳定。

已在 head 的 src/TabNavList/index.tsx 中核对以下实现：

• isScaled 以宽或高与 offset 尺寸的差值绝对值是否至少为 1 判定缩放。
• getTabSize 和 getSize 新增 forceOffset 参数。强制时使用 offset 坐标，未强制且未缩放时使用 getBoundingClientRect。
• shouldUseOffset 检查 containerRef 和 tabListRef。任一元素缩放时，标签测量使用 offset 坐标。updateTabSizes 默认使用该结果。

这些代码覆盖了问题描述的根因。在复现场景中，容器约 198px，其 DOMRect 与 offset 差值超过 1，判定为缩放。54px 标签的差值小于 1。修复后，标签与容器统一使用 offset 坐标，不再混用两种坐标系。

根据 PR 摘要，onListHolderResize 对容器、附加内容、添加按钮和操作区使用同一缩放判定结果。该代码段因仓库读取输出截断而未直接核对，本结论依赖 PR 摘要的描述。

测试：PR 描述报告新增的水平、RTL、垂直及小数尺寸回归用例中，有四项在未修改的上游源码上失败。我未能读取测试文件差异，故未独立核对这些测试。浏览器对比结果也由 PR 报告，我未重新执行。

未发现与需求相冲突的实现。

Full details: Out of Scope Changes check

Explanation

变更范围集中于两处：src/TabNavList/index.tsx 的测量逻辑，以及 tests/overflow.test.tsx 的回归测试。

• 测量逻辑修改直接对应 [#1027] 的根因。新增的 forceOffset、isScaled 和 shouldUseOffset 都用于在缩放布局中统一坐标系。
• 未缩放的小数尺寸仍使用 getBoundingClientRect，符合 PR 描述的保留要求。独立变换的子元素仍使用既有的局部回退逻辑。
• 测试变更覆盖水平、RTL、垂直布局，以及真实溢出标签通过 More 访问。另有一项既有小数尺寸测试被改为提供更真实的父级矩形，并保留了指示条的小数断言。该修改与本次修复直接相关。

未发现与 [#1027] 无关的功能或配置变更。未直接核对的测试文件差异与 onListHolderResize 代码段，仅依据 PR 摘要判断，未发现与其冲突的证据。

Full details: Docstring Coverage

Explanation

Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 2 functions across 2 files.

Resolution

Write docstrings for the functions missing them to satisfy the coverage threshold.

Finishing Touches

Generate unit tests (beta)

• Create a new PR

• Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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_{我是小兔，蹦到标签栏边，
看见缩放，便量 offset 坐标。
水平、RTL、垂直，一一试过，
溢出时，菜单仍能选中标签。
小数尺寸安稳，我抱着胡萝卜跳。}

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Failed pre-merge checks:
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Write docstrings for the functions missing them to satisfy the coverage
threshold.

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• src/TabNavList/index.tsx
• tests/overflow.test.tsx

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