src/vs/editor/common/core/selection.ts/Selection/selectionsEqual
class Selection:	public static selectionsEqual(a: ISelection, b: ISelection): boolean {
		return (
			a.selectionStartLineNumber === b.selectionStartLineNumber &&
			a.selectionStartColumn === b.selectionStartColumn &&
			a.positionLineNumber === b.positionLineNumber &&
			a.positionColumn === b.positionColumn
		);
	}