AnimationCurveI17F15.Keys セット時にソートされない不具合を修正

[agate-pris]

• AnimationCurveI17F15.Keys セット時に挿入ソートを行うように修正
• 上記の実装のために Utiliity.InsertionSort を追加
• Unity.AnimationCurve.keys と動作が同等であることを確認するテストを追加

[Copilot]

Pull Request Overview

This PR implements stable sorting for AnimationCurve keyframes by introducing a custom insertion sort algorithm. The change ensures that keyframes with equal time values maintain their original relative order after sorting.

• Added a new Utility class with a stable InsertionSort implementation
• Updated AnimationCurveI17F15.Keys setter to use the stable insertion sort
• Added comprehensive tests to verify stable sorting behavior for both Unity's AnimationCurve and the custom AnimationCurveI17F15

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
Intar/Utility.cs	New utility class containing stable insertion sort implementation
Intar/Utility.cs.meta	Unity metadata file for the new Utility.cs
Intar/AnimationCurveI17F15.cs	Updated Keys setter to use stable insertion sort
Intar.Tests/AnimationCurveTest.cs	Added test case verifying stable sort behavior for AnimationCurveI17F15
Intar.Tests/AnimationCurveTest.Unity.cs	Added test case verifying stable sort behavior for Unity's AnimationCurve

Comments suppressed due to low confidence (1)

Intar/AnimationCurveI17F15.cs:117

• The MoveKey method uses List<T>.Sort which is not stable, while the Keys setter uses Utility.InsertionSort for stable sorting. For consistency and to maintain stable sort behavior throughout the API, consider using Utility.InsertionSort(keys, (a, b) => a.Time.CompareTo(b.Time)) here as well.

            keys.Sort((a, b) => a.Time.CompareTo(b.Time));

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[Copilot]

Pull Request Overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated no new comments.

[Copilot]

Pull Request Overview

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

[Copilot]

MoveKeyメソッド(117行目)ではList<T>.Sortを使用していますが、KeysセッターではInsertionSortを使用しており、ソートアルゴリズムが統一されていません。MoveKeyも安定ソートにするべきではないでしょうか。一貫性のため、MoveKeyでもUtility.InsertionSortを使用することを検討してください。