src/vs/workbench/common/contextkeys.ts/ResourceContextKey/reset
class ResourceContextKey:	reset(): void {
		this._value = undefined;
		this._contextKeyService.bufferChangeEvents(() => {
			this._resourceKey.reset();
			this._schemeKey.reset();
			this._filenameKey.reset();
			this._dirnameKey.reset();
			this._pathKey.reset();
			this._langIdKey.reset();
			this._extensionKey.reset();
			this._hasResource.reset();
			this._isFileSystemResource.reset();
		});
	}