fix(tabs): 修复tabs数量过多时的滚动操作bug

[mikasayw]

• Fix: 修复 tabs 滚动逻辑（ps:当tabs 滚动到最后一个tab时，此时点击当前范围内可见的第一个tab，此时不会将选中tab滚动于中间显示，导致无法看见当前和之前的tab）
  Tabs 数量多,滚动操作时有bug #2653
  [FR]: Tabs增加控制自定义内部ScrollIntoView的方法 #2923
  Tabs 选项卡 数量多横向切换滚动位置bug #2930

🤔 这个变动的性质是？

• 新特性提交
• 日常 bug 修复
• 站点、文档改进
• 演示代码改进
• 组件样式/交互改进
• TypeScript 定义更新
• 包体积优化
• 性能优化
• 功能增强
• 国际化改进
• 重构
• 代码风格优化
• 测试用例
• 分支合并
• 其他改动（是关于什么的改动？）

🔗 相关 Issue

💡 需求背景和解决方案

☑️ 请求合并前的自查清单

⚠️ 请自检并全部勾选全部选项。⚠️

• 文档已补充或无须补充
• 代码演示已提供或无须提供
• TypeScript 定义已补充或无须补充
• fork仓库代码是否为最新避免文件冲突
• Files changed 没有 package.json lock 等无关文件

Summary by CodeRabbit

• 重构
  • 优化了滚动处理逻辑，取消了原先采用动画过渡的方式，现直接设置滚动位置，实现更迅速、直接的定位。
  • 简化了视图滚动判断，确保内容在滚动时能够稳定、准确地显示。

[coderabbitai]

Walkthrough

此次变更简化了滚动逻辑。在 scrollDirection 函数中，移除了原先通过 requestAnimationFrame 循环实现动画的机制，直接根据滚动方向调用 setScrollLeft 或 setScrollTop 设置滚动位置。同时在 scrollIntoView 函数中，删除了对 to 值小于 0 时的提前返回判断，始终将 to 值传递给 scrollDirection。代码中还增加了中文注释，说明使用 ScrollView 不需要手动处理 raf。

Changes

文件路径	变更概述
src/.../tabs.taro.tsx	1. 在 scrollDirection 中移除 raf 动画逻辑，直接设置水平或垂直滚动。 2. 在 scrollIntoView 中删除对 to < 0 的判断，总是调用 scrollDirection。

Sequence Diagram(s)

sequenceDiagram
    participant U as 用户触发事件
    participant SI as scrollIntoView
    participant SD as scrollDirection
    participant SC as 滚动组件

    U->>SI: 请求滚动至位置
    SI->>SD: 调用 scrollDirection(to, direction)
    alt direction == horizontal
        SD->>SC: 调用 setScrollLeft(to)
    else direction == vertical
        SD->>SC: 调用 setScrollTop(to)
    end

Loading

Possibly related PRs

• fix(tabs): 修复tabs异步设置titles滚动失效（#2351） #2369: 修改 scrollIntoView 函数以解决滚动问题，与本次滚动逻辑的修改存在直接代码关联。
• fix(tabs): clicked tabs should be entirely visible & fix ci install failed #2685: 涉及 scrollIntoView 函数的调整，与本 PR 中滚动逻辑变更高度相关。
• fix(tabs.taro.tsx): 解决在不需要滚动的时候，切换tab产生tab位置错乱的问题  #2554: 调整了 scrollDirection 函数中对 to 参数的判断，与本 PR 移除条件判断存在直接代码级冲突。

Suggested reviewers

• oasis-cloud
• Alex-huxiyang

Poem

🐇 啊哈，新代码，摆脱旧套路，
轻捷跳跃，滚动直接无阻拦。
优化逻辑，小跳大步不停转，
从此页面飞梭如风般。
快乐代码，兔子歌声悠然扬！
🌟🐰

---

📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 994800f and 376f691.

📒 Files selected for processing (1)

• src/packages/tabs/tabs.taro.tsx (2 hunks)

⏰ Context from checks skipped due to timeout of 90000ms (1)

• GitHub Check: build

🔇 Additional comments (2)

src/packages/tabs/tabs.taro.tsx (2)

163-165: 代码简化得当！

移除了手动动画处理逻辑，直接使用 ScrollView 组件的内置滚动功能是正确的做法。这样可以：

• 减少代码复杂度
• 提高滚动的可靠性
• 让组件的行为更加可预测

---

188-189:

❓ Verification inconclusive

请验证边界情况下的滚动行为

移除了对滚动位置的预检查，直接调用 scrollDirection。虽然这样可以解决当前的滚动问题，但建议验证以下场景：

• 首个标签页的滚动行为
• 最后一个标签页的滚动行为
• 快速切换标签页时的滚动表现

---

🏁 Script executed:

#!/bin/bash
# 搜索相关测试用例，确保边界情况已被覆盖
rg -l "test.*scroll.*tab" "test.*first.*tab" "test.*last.*tab"

Length of output: 177

---

请手动验证边界滚动表现

当前代码在移除了边界预检查后直接调用 scrollDirection(to, direction)，可能会带来以下风险：

• 首个标签页的滚动行为是否正常（存在因缺少预检查而导致的异常）
• 最后一个标签页的滚动表现是否符合预期
• 快速切换标签页时滚动动作是否存在遗漏或异常

注意：自动搜索测试用例的命令未返回预期结果，请手动检查或补充相应的测试用例，以确保上述边界情况均得到妥善处理。

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• 📝 Generate Docstrings (Beta)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.56%. Comparing base (994800f) to head (376f691).
Report is 1 commits behind head on next.

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #3014   +/-   ##
=======================================
  Coverage   85.56%   85.56%           
=======================================
  Files         267      267           
  Lines       18003    18003           
  Branches     2726     2726           
=======================================
  Hits        15405    15405           
  Misses       2595     2595           
  Partials        3        3           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[mikasayw]

#2554 此PR的错乱问题从逻辑上看起来与父级tab的滚动距离没有关系