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kotlinlang

Hi, what is this error about?
`Suspicious equality check: equals() is not implemented in Object`

```
override fun areContentsTheSame(oldItemPosition: Int, newItemPosition: Int) =
        oldList[oldItemPosition] == newList[newItemPosition] &lt;----------
```

Type of the list items is ChatItem, which is a sealed class


```
sealed class ChatItem

object ProgressBarItem : ChatItem()

data class ThreadHeaderItem(
    val commenterUsername: String,
    val commenterRealName: String?,
    val commenterImageUrl: String?,
    val commentedUsername: String,
    val commentedRealName: String?,
    val commentedTimestamp: LocalDateTime
) : ChatItem(), ThreadPart

data class AddCommentItem(val message: Message) : ChatItem(), ThreadPart
data class DateItem(val date: LocalDateTime) : ChatItem()
```

ChatItem doesn’t guarantee to have equals

you can suppress the error with ```@Suppress("DiffUtilEquals")```

See <https://youtrack.jetbrains.com/issue/KT-31239> and <https://issuetracker.google.com/issues/132234925>