Missing Deletions

[Kyle Robson]

Checklist

• This is not a Apple's bug.
• Reviewed the README and documents.
• Searched existing issues for ensure not duplicated.

Expected Behavior

My StagedChangeset's stages should contain a deletion of indexes: [1]

Current Behavior

My StagedChangeset's stages contains deletions of [] for all stages.

Steps to Reproduce

        // MockItem uses:
        // Just `diffID` comparison for `differenceIdentifier`.
        // Just `content` comparison for `isContentEqual`.
        // Both `diffID` and `content` comparison for `==` `Equatable` implementation of `MockItem`.

        let mock1a = MockItem(diffID: 1, content: "a")  
        let mock2 = MockItem(diffID: 2, content: "a")  
        let mock3a = MockItem(diffID: 3, content: "a")
        let mock3b = MockItem(diffID: 3, content: "b")  
        let mock4 = MockItem(diffID: 4, content: "a")
        
        let first = [mock1a, mock2, mock3a]
        let second = [mock3b, mock1a, mock4]

Expect changes to contain three changes:

1. Updates: [2]. Should transform [mock1a, mock2, mock3a] to [mock1a, mock2, mock3b].
2. Deletes: [1]. Should transform [mock1a, mock2, mock3b] to [mock1a, mock3b].
3. Inserts and Moves. Inserts: [2]. Moves: (0, 1) or (1, 0). Should transform [mock1a, mock3b] to [mock3b, mock1a, mock4].

Actual Deletes is [] instead of [1] during step (2).

Environments

• Library version: Master

• Swift version: 4.2

• iOS version: 12

• Xcode version: 10.1

• Devices/Simulators: DifferenceKit, "My Mac", CMD+U

• CocoaPods/Carthage version: N/A

[Ryo Aoyama]

@kylerobson
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