src/vs/base/common/diff/diff.ts/LcsDiff/ElementsAreStrictEqual
class LcsDiff:	private ElementsAreStrictEqual(originalIndex: number, newIndex: number): boolean {
		if (!this.ElementsAreEqual(originalIndex, newIndex)) {
			return false;
		}
		const originalElement = LcsDiff._getStrictElement(this._originalSequence, originalIndex);
		const modifiedElement = LcsDiff._getStrictElement(this._modifiedSequence, newIndex);
		return (originalElement === modifiedElement);
	}