fix: 同じメッセージが編集されたかどうかのチェックを追加

[MikuroXina]

Type of Change:

バグ修正のための機能追加

Details of implementation (実施内容)

バグの再現性があまり無いため, とりあえず応急処置的な対策をしてみました.

[codecov-commenter]

Codecov Report

Merging #447 (dad1bf5) into main (8f8b226) will decrease coverage by 0.04%.
The diff coverage is 50.00%.

❗ Current head dad1bf5 differs from pull request most recent head f375996. Consider uploading reports for the commit f375996 to get more accurate results

@@            Coverage Diff             @@
##             main     #447      +/-   ##
==========================================
- Coverage   71.37%   71.32%   -0.05%     
==========================================
  Files          58       58              
  Lines        3933     3944      +11     
  Branches      369      369              
==========================================
+ Hits         2807     2813       +6     
- Misses        757      762       +5     
  Partials      369      369              

Flag	Coverage Δ
unittests	71.32% <50.00%> (-0.05%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/adaptor/proxy/middleware.ts	73.58% <50.00%> (-4.99%)	⬇️

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[m1sk9]

テストとかは追加しないん？

[MikuroXina]

@m2en こちらはアダプタの実装なので, 実際に実行してみる以外にテストできないかと思います. 一応, 報告されたケースで改善されたことは確認できました.

[github-actions]

🎉 This PR is included in version 1.25.1 🎉

The release is available on:

• GitHub release
• v1.25.1

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