Fix placeholder visibility inheritance

[QDyanbing]

变更内容

• 移除 placeholder 默认写入的 visibility: visible，让其继承父级 visibility。
• 保留 placeholder 需要隐藏时的 visibility: hidden 行为。
• 新增父级 visibility: hidden 的回归测试，并更新相关快照。

修复原因

关联 ant-design/ant-design#58567。TreeSelect/Select 外层设置 visibility: hidden 时，placeholder 内联 visibility: visible 会覆盖父级隐藏状态，导致 placeholder 仍可见。

验证

• npm test 通过（21 suites / 428 tests）
• npm run lint -- --quiet 通过
• git diff --check 通过
• npm run tsc 未通过：本地 node_modules 缺少 package.json 中声明的 devDependency @rc-component/dialog，报错位置是 docs/examples/getPopupContainer.tsx，与本次改动无关。

Summary by CodeRabbit

• Bug Fixes
  • 优化了占位符的样式处理，避免在某些隐藏场景下强制显示占位内容。
  • 当选择器本身设置为隐藏时，占位符会保持正确的可见性表现，不再覆盖外层样式。
• Tests
  • 新增相关测试，覆盖选择器隐藏时占位符的显示行为。

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: b41dab05-b74b-4efb-9011-e744362c0764

📥 Commits

Reviewing files that changed from the base of the PR and between 6c396cb and b30d2ac.

⛔ Files ignored due to path filters (2)

• tests/__snapshots__/Combobox.test.tsx.snap is excluded by !**/*.snap
• tests/__snapshots__/ssr.test.tsx.snap is excluded by !**/*.snap

📒 Files selected for processing (2)

• src/SelectInput/Content/Placeholder.tsx
• tests/placeholder.test.tsx

---

Walkthrough

Placeholder 组件的内联样式由"始终显式写入 visibility"改为"仅在 show 为 false 时才注入 visibility: hidden"，show 为 true 时不再强制设置该字段。新增一条测试用例，验证父级 visibility: hidden 不被 placeholder 的样式覆盖。

Changes

Placeholder 可见性修复

Layer / File(s)	Summary
Placeholder visibility 条件注入及测试 src/SelectInput/Content/Placeholder.tsx, tests/placeholder.test.tsx	Placeholder 的 style 仅在 show 为 false 时写入 visibility: hidden，show 为 true 时省略该字段；新增测试断言在 Select 设置 style={{ visibility: 'hidden' }} 时，placeholder 的 style 不包含 visibility: visible。

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• react-component/select#1167：同样修改了 src/SelectInput/Content/Placeholder.tsx 中的 visibility 处理逻辑，与本 PR 直接相关。
• react-component/select#1192：调整了 MultipleContent 中 Placeholder 的渲染时机，影响 placeholder 的可见性行为，与本 PR 的修改方向相关。
• react-component/select#1194：同样避免显式强制设置 visibility: visible，使父级 visibility: hidden 能正常向下继承。

Suggested reviewers

• zombieJ

Poem

🐰 小兔子写样式，不再强行 visible，
父级藏起来，placeholder 也乖乖跟随，
hidden 时才说话，show 时沉默如风，
测试守护边界，bug 无处遁形～ 🎉

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	标题准确概括了本次修复的核心：placeholder 的 visibility 继承问题。
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

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• Create PR with unit tests

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.44%. Comparing base (6c396cb) to head (b30d2ac).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1237   +/-   ##
=======================================
  Coverage   99.44%   99.44%           
=======================================
  Files          31       31           
  Lines        1271     1271           
  Branches      444      464   +20     
=======================================
  Hits         1264     1264           
  Misses          7        7           

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[zombieJ]

Looks good to me. The placeholder no longer forces visibility: visible, preserving parent visibility inheritance while keeping the hidden placeholder path covered.