fix: stop measure when the anchored prefix is removed

[dogledogle]

fix ant-design/ant-design#27426

问题

文本中已有一个 @ 时，再输入一个 @ 打开候选框，随后按 Backspace 删除它，候选框会关闭后立刻重新出现在前一个 @ 的位置，并显示 Not Found。

原因

删除前缀符只更新了文本，测量状态未终止。随后的 keyup 会查找光标前最后一个 @（即文本中更早的旧 @），而原有逻辑只要测量中就无条件重新测量，于是错误地锚到了旧 @ 上。

修复

测量进行中时校验原测量位置的前缀符是否还存在：

• 已被删除则直接停止测量，不再跳转到更早的前缀，同时不再用无效文本触发 onSearch；
• 其余行为（输入/删除搜索字符、ESC/Enter/方向键、AZERTY 键盘、多前缀配置等）保持不变。

测试

• 新增回归测试 stop measure if remove prefix and previous prefix exists（未修复时失败，修复后通过）；
• 全量测试 55/55 通过，快照无变化；tsc、eslint 通过。

Summary by CodeRabbit

• Bug Fixes

  • 修复删除刚输入的 @ 前缀后，提及测量状态未正确停止的问题。
  • 避免系统错误地重新定位到文本中更早存在的 @ 前缀。

• Tests

  • 新增测试，验证删除当前测量前缀后提及测量会停止。

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• src/Mentions.tsx
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Walkthrough

本次变更更新 onInternalKeyUp 的测量前缀判断。当用户删除当前测量前缀时，组件停止测量，不再重新定位到文本中更早的前缀。新增测试覆盖该场景。

Changes

测量前缀处理

Layer / File(s)	Summary
前缀删除处理与测试 src/Mentions.tsx, tests/FullProcess.spec.tsx	onInternalKeyUp 检查当前选择位置是否仍包含测量前缀。前缀被删除时调用 stopMeasure()。新增测试验证存在更早 @ 时不会重新锚定。

Priority: ⬇️ Low — Defer this mentions-input fix because it narrowly prevents a stale empty-results dropdown after deleting an @ prefix.

Estimated code review effort: 2 (Simple) | ~10 minutes

Severity of issue fixed: Low

Merge Risk: ⚪ Minimal · up to fb8fe

The change stops mention measurement when its active prefix is deleted, preventing a stale empty-results dropdown from reopening. No merge-blocking risk remains.

Suggested reviewers: qdyanbing, afc163, emilyyyliu

🚥 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“fix: stop measure when the anchored prefix is removed”准确概括了主要修复内容：删除锚定前缀时停止测量。标题简洁且与变更直接相关。
Linked Issues check	✅ Passed	变更满足问题 #27426 的要求。代码检查锚定的测量前缀是否仍存在；当前缀被删除时调用 stopMeasure()，因此不会重新显示“Not Found”下拉框。新增回归测试验证了该行为。
Out of Scope Changes check	✅ Passed	变更仅涉及 Mentions 测量逻辑和对应的回归测试。所有变更都服务于问题 #27426，未发现无关或超出范围的代码变更。
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2…

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_{小兔挥爪改测量，
删除前缀即停航。
旧的符号不再追，
测试守住新方向。
胡萝卜旁庆功忙。}

_{Comment @coderabbitai help to get the list of available commands.}