src/vs/platform/undoRedo/common/undoRedoService.ts/UndoRedoService/_print
class UndoRedoService:	private _print(label: string): void {
		console.log(`------------------------------------`);
		console.log(`AFTER ${label}: `);
		let str: string[] = [];
		for (const element of this._editStacks) {
			str.push(element[1].toString());
		}
		console.log(str.join('\n'));
	}