fix: refine placeholder rendering logic in MultipleContent component

[Wxh16144]

bg: https://github.com/react-component/select/pull/1166/changes#r2707079879
fix: ant-design/ant-design#56587

Summary by CodeRabbit

发布说明

• Bug修复
  • 优化了多选输入框占位符显示逻辑：仅在无显示值且输入框为空时显示，移除对搜索/触发打开状态的依赖，提升一致性与可预测性。
• 测试
  • 新增自动化测试，验证标签模式下占位符在初始与输入后行为符合预期。

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[vercel]

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[coderabbitai]

Walkthrough

将 MultipleContent 中 Placeholder 的渲染条件由依赖 searchValue/triggerOpen 收紧为仅在无 displayValues 且 inputValue 为假值时渲染；新增测试覆盖 tags 模式下 open={false} 时占位符随输入消失的行为。

Changes

内聚组 / 文件(s)	变更摘要
占位符渲染逻辑 src/SelectInput/Content/MultipleContent.tsx	调整 Placeholder 渲染条件：仅在没有 displayValues 且 inputValue 为假值时渲染；移除对 triggerOpen 与 searchValue 的依赖，修复 tags 模式下 open={false} 时占位符不消失的问题。
单元测试 tests/Tags.test.tsx	新增用例：在 mode="tags" 且 open={false} 场景下，验证占位符初始可见且在用户输入后隐藏（模拟输入行为）。

Sequence Diagram(s)

（跳过：变更为单组件内渲染条件调整，不满足生成序列图的条件）

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• refactor: placeholder move into the content #1167 — 同步修改 src/SelectInput/Content/MultipleContent.tsx 中占位符渲染条件的变更。
• feat: add more semantic structure #1168 — 另一个对 MultipleContent/Placeholder 渲染逻辑的相关调整。
• fix: tagRender should not be called when value is empty #1109 — 涉及 multiple-select/tags 模式下无值时占位符/标签渲染行为的更改。

Suggested reviewers

• afc163
• zombieJ

Poem

🐰 轻跳到代码园，
占位符在风中眠，
输入一声它即隐，
tags 下不再留痕迹，
小改一行笑颜展 ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	标题明确总结了主要变更：改进MultipleContent组件中的占位符渲染逻辑。
Linked Issues check	✅ Passed	代码变更通过修改占位符渲染条件，使其直接依赖inputValue而非searchValue和triggerOpen，从而修复tags模式下open={false}时输入不隐藏占位符的问题，符合#56587的核心要求。
Out of Scope Changes check	✅ Passed	所有代码变更均与修复占位符渲染逻辑的目标相关，包括MultipleContent.tsx的逻辑调整和新增测试用例，不存在超出范围的修改。
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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[gemini-code-assist]

Summary of Changes

Hello @Wxh16144, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a specific bug in the MultipleContent component's placeholder display. By adjusting the rendering condition, the placeholder will now accurately reflect the component's state, appearing only when there are no selected values and no active search input, thereby improving the user experience and component behavior.

Highlights

• Placeholder Rendering Logic: Refined the conditional logic for rendering the Placeholder component in MultipleContent.tsx to ensure it only appears when no items are selected and no search value is present. This resolves an issue where the placeholder might have been displayed under incorrect conditions.

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[gemini-code-assist]

Code Review

This pull request refines the rendering logic for the placeholder in the MultipleContent component. The change simplifies the condition for displaying the placeholder by removing its dependency on the triggerOpen state. Now, the placeholder is shown only when there are no selected values and no search value. This correctly handles cases, especially with a controlled searchValue, where the placeholder was previously displayed incorrectly when the dropdown was closed. The change is correct and improves the component's behavior.

[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@src/SelectInput/Content/MultipleContent.tsx`:
- Line 203: The placeholder visibility check currently uses searchValue but the
displayed input uses computedSearchValue (which may be cleared when the dropdown
closes via autoClearSearchValue), causing a brief mismatch; update the prefix
condition in MultipleContent (where prefix={!displayValues.length &&
!searchValue && <Placeholder />}) to use computedSearchValue (or inputValue)
instead of searchValue so the placeholder rendering matches the actual displayed
value state; ensure references to
computedSearchValue/autoClearSearchValue/inputValue are used consistently in
MultipleContent and any related render logic.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.42%. Comparing base (947131a) to head (d0dcbaa).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1192   +/-   ##
=======================================
  Coverage   99.42%   99.42%           
=======================================
  Files          31       31           
  Lines        1219     1219           
  Branches      412      432   +20     
=======================================
  Hits         1212     1212           
  Misses          7        7           

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[afc163]

补个用例，和 single 一起各补一个一样逻辑的。

[Wxh16144]

补个用例，和 single 一起各补一个一样逻辑的。

我是想补的，但是感觉这个 case 很难写，需要 open={false} and mode="tags" 的时候才会触发 issue 描述中的错误