完善消息去重并增加说明文档

[chenjei2011]

功能描述

消息去重机制当遇到多个_deduplicationWindowSeconds秒(目前为2秒)之内的重复消息会进行拦截使重复消息只显示一次

需求动机

当异常代码引起的死循环弹消息发生时能有效拦截避免干扰课堂

ps. 当收到重复消息时,系统会将去重窗口的起始时间更新为当前消息的到达时间，使窗口持续向后“滑动”,当代码异常导致消息在极短时间内（远小于 2 秒）疯狂循环触发时，滚动窗口会随着每一条新消息的到来不断向后“滚动”重置.

[augmentcode]

🤖 Augment PR Summary

Summary: This PR improves the in-app notification deduplication logic to better suppress rapid-fire repeated messages in classroom scenarios.

Changes:

• Refactors the dedup state tracking in NotificationCenterService and introduces a 2-second sliding window.
• Expands duplicate detection to require matching Title, Summary, and Source.
• Updates the window start time on each duplicate to keep “spamming” notifications silent until they stop.
• Adds a one-time log entry when the first duplicate in a sequence is intercepted.
• Adds a short Markdown doc describing the deduplication rules and behavior.

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[augmentcode]

Review completed. 2 suggestions posted.

Comment augment review to trigger a new review at any time.

[augmentcode]

message.CreatedAt - _lastMessage.Time 可能出现负数（例如消息乱序/时钟差），此时 totalSeconds <= _deduplicationWindowSeconds 仍会成立，导致“更早”的消息被误判为重复并被静默丢弃。考虑对负间隔做保护（例如仅在 interval >= 0 时才参与窗口判定）。

Severity: medium

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[augmentcode]

这里用 IsNullOrEmpty 会让仅包含空白的 Title 也参与去重，而入口过滤用的是 IsNullOrWhiteSpace，且文档也写了“标题为空不参与去重”。如果希望空白标题不参与，建议统一空/空白判断口径。

Severity: low

Other Locations

• Ink Canvas/Helpers/NotificationCenterService.cs:71
• rules/消息去重说明.md:10

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[CJKmkp]

喵喵

[CJKmkp]

可以优化一下时间那里的判断

[chenjei2011]

可以优化一下时间那里的判断

等我下个星期有空就改，喵)

[CJKmkp]

好的