message: Retain if pop time is in the future
diff: @@ -18,7 +18,7 @@ class Ghost extends React.Component<{getKey: any, data: any, children: any}, {it
  nextItem.popTime = !matchedItem ? (item.popTime || tick + 1000) : undefined;
  return nextItem;
  })
  - .filter(item => !item.popTime || item.popTime < tick)
  + .filter(item => !item.popTime || tick < item.popTime)
  .concat(data
  .filter(item => !itemsByKey[getKey(item)])
  .map(item => {
  