MergeConfigValue
constructor(sibling: () -> EditorSession? = null, highlightChanges: Boolean = true, markGutter: Boolean = true, syntaxHighlightDeletions: Boolean = true, syntaxHighlightDeletionsMaxLength: Int = 3000, mergeControls: Boolean = true, overrideChunk: (EditorState, Chunk, RangeSetBuilder<Decoration>, RangeSetBuilder<GutterMarker>?) -> Boolean? = null, side: MergeSide = MergeSide.B)