fix(input): make batch result logic consistent with comment

[Yundi339]

说明

同步上游修复 LizardByte/Sunshine#5456。

__builtin_add_overflow 在发生溢出时返回 true。原有判断取反后，会在没有溢出时终止批处理，与注释及函数语义相反。

本 PR 修正以下批处理路径：

• 相对鼠标移动的 X/Y 增量
• 垂直滚轮增量
• 水平滚轮增量

补丁通过 cherry-pick -x 引入，保留上游作者和原始提交来源。

验证

• 已确认可无冲突应用到当前 master
• git diff --check 通过
• 未执行编译、构建或测试命令

[coderabbitai]

Summary by CodeRabbit

• Bug Fixes
  • 修复相对鼠标移动及垂直、水平滚轮事件的输入合并逻辑。
  • 改善数值溢出场景下的安全处理，确保事件能够正确中止或继续合并。

Walkthrough

修正相对鼠标移动、垂直滚轮和水平滚轮批处理中的溢出判断，使发生 16-bit 加法溢出时终止消息合并。

Changes

输入批处理溢出判断

Layer / File(s)	Summary
输入消息溢出检查修正 src/input.cpp	相对鼠标移动及垂直、水平滚轮消息改为直接判断 __builtin_add_overflow；任一加法溢出时返回 terminate_batch。

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

Suggested reviewers: qiin2333

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	标题准确概括了批处理逻辑修正，且与本次修复内容一致。
Description check	✅ Passed	描述与变更内容一致，说明了修复范围、来源和验证情况。
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/backport-lizardbyte-5456

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[coderabbitai]

🧹 Nitpick comments (1)

src/input.cpp (1)

1423-1426: 🎯 Functional Correctness | 🔵 Trivial | ⚡ Quick win

建议补充三类输入的溢出回归测试。

覆盖相对鼠标 X/Y、垂直滚轮和水平滚轮在无溢出时继续合并、在 16-bit 上下界溢出时返回 terminate_batch 的场景。

Also applies to: 1465-1465, 1486-1486

🤖 Prompt for AI Agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

In `@src/input.cpp` around lines 1423 - 1426, 为处理批次合并逻辑补充溢出回归测试，覆盖相对鼠标
X/Y、垂直滚轮和水平滚轮三类输入。每类都验证未溢出时继续合并，并验证 16-bit 上界及下界溢出时返回 terminate_batch；重点覆盖对应的
deltaX、deltaY 以及滚轮累加逻辑。

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Nitpick comments:
In `@src/input.cpp`:
- Around line 1423-1426: 为处理批次合并逻辑补充溢出回归测试，覆盖相对鼠标
X/Y、垂直滚轮和水平滚轮三类输入。每类都验证未溢出时继续合并，并验证 16-bit 上界及下界溢出时返回 terminate_batch；重点覆盖对应的
deltaX、deltaY 以及滚轮累加逻辑。

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: eb9e87a4-8a11-41ab-8475-af58024c3b4c

📥 Commits

Reviewing files that changed from the base of the PR and between c172c62 and 8d4bd54.

📒 Files selected for processing (1)

• src/input.cpp

📜 Review details

⏰ Context from checks skipped due to timeout. (1)

• GitHub Check: Windows

🧰 Additional context used

📓 Path-based instructions (1)

src/**/*.{cpp,c,h}

⚙️ CodeRabbit configuration file

src/**/*.{cpp,c,h}: Sunshine 核心 C++ 源码，自托管游戏串流服务器。审查要点：内存安全、 线程安全、RAII 资源管理、安全漏洞。注意预处理宏控制的平台相关代码。

Files:

• src/input.cpp

🔇 Additional comments (3)

src/input.cpp (3)

1423-1426: LGTM!

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1465-1465: LGTM!

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1486-1486: LGTM!