fix(tooltip): tooltip 源码，始终显示 popup

[engvuchen]

closed #6028

🤔 这个 PR 的性质是？

• 日常 bug 修复
• 新特性提交
• 文档改进
• 演示代码改进
• 组件样式/交互改进
• CI/CD 改进
• 重构
• 代码风格优化
• 测试用例
• 分支合并
• 其他

🔗 相关 Issue

#6028

💡 需求背景和解决方案

改动说明：

1. tooltip 中的 popup，始终显示；

   1. 解决问题：content 的内容，当键入第一个字符、删除最后一个字符，触发 textarea 销毁，导致计算高度找不到 textarea 了，报错

2. 取消 textarea onBlur 的计算高度

   1. 解决问题：在被 tooltip 包裹的 textarea 键入字符，不移出，5s 后隐藏 tooltip，触发 textarea onblur，也会计算高度，上面一样的问题

3. popup 新增 isEmptyContent

   1. content 为空字符串，tooltip 原表现不显示浮层，由 tooltip 代码切换实现；
   2. 目前是增强了 hidePopup 判断，需要业务主动加上 hideEmptyPopup

4. 去掉了一个 inner 的重复监听

📝 更新日志

• 本条 PR 不需要纳入 Changelog

tdesign-vue-next

@tdesign-vue-next/chat

@tdesign-vue-next/auto-import-resolver

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commit: c1be90c

[Copilot]

Pull Request Overview

This PR fixes a bug in the tooltip component where popup positioning fails when content changes during textarea height calculations. The fix ensures tooltips remain visible consistently and prevents errors when the textarea element is destroyed during content updates.

• Always display tooltip popup to prevent element destruction issues
• Remove textarea height calculation on blur events to avoid timing conflicts
• Enhanced empty content detection for better popup visibility control

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
packages/components/tooltip/tooltip.tsx	Removes early return for empty content to always render popup
packages/components/textarea/textarea.tsx	Removes height calculation on blur and consolidates value watchers
packages/components/popup/popup.tsx	Adds improved empty content detection function

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[Copilot]

The parameter type 'any' is too broad and reduces type safety. Consider using a more specific type like 'VNode | string | null | undefined' or creating a union type for the expected node types.