src/vs/editor/browser/widget/diffReview.ts/DiffReview/_compute
class DiffReview:	private _compute(): Diff[] {
		const lineChanges = this._diffEditor.getLineChanges();
		if (!lineChanges || lineChanges.length === 0) {
			return [];
		}
		const originalModel = this._diffEditor.getOriginalEditor().getModel();
		const modifiedModel = this._diffEditor.getModifiedEditor().getModel();

		if (!originalModel || !modifiedModel) {
			return [];
		}

		return DiffReview._mergeAdjacent(lineChanges, originalModel.getLineCount(), modifiedModel.getLineCount());
	}