src/vs/platform/undoRedo/common/undoRedoService.ts/ResourceEditStack/constructor
class ResourceEditStack:	constructor(resourceLabel: string, strResource: string) {
		this.resourceLabel = resourceLabel;
		this.strResource = strResource;
		this._past = [];
		this._future = [];
		this.locked = false;
		this.versionId = 1;
	}