Rollback react-virtualized to 8.7.1 (https://github.com/bvaughn/react-virtualized/issues/524)
Rollback react-virtualized to 8.7.1 (https://github.com/bvaughn/react-virtualized/issues/524)

cncjs/cncjs,cheton/piduino-grbl,cncjs/cncjs,cheton/cnc.js,cheton/cnc,cheton/piduino-grbl,cncjs/cncjs,cheton/piduino-grbl,cheton/cnc.js,cheton/cnc,cheton/cnc.js,cheton/cnc