message: Change the focus tracking to work once an item is at least 50% in view.
diff: @@ -96,7 +96,7 @@ export class ScrollInviewContainer {
  // Loop over trying to find the new active.
  for (const i of this.controllers) {
  focusedItem =
  - i.latestThreshold !== 0 &&
  + i.latestThreshold >= 0.5 &&
  (!focusedItem || i.latestThreshold > focusedItem.latestThreshold)
  ? i
  : focusedItem;
  