Remove invariant on nested sibling VirtualizedLists without unique li…

…stKey props

Summary:
It's easy to accidentally trigger this invariant when adding / moving around a component that relies on a FlatList.

There might be some unexpected behavior when this occurs, i.e. messed up virtualization / viewability logging. But to me, that is a better outcome than crashing the JS context.

Reviewed By: sahrens

Differential Revision: D14975295

fbshipit-source-id: 18015a780a153aae995723b120440be0e55d8e8b

Libraries/Lists/VirtualizedList.js

@@ -526,12 +526,13 @@ class VirtualizedList extends React.PureComponent<Props, State> {
  this._cellKeysToChildListKeys.set(childList.cellKey, childListsInCell);
 
  const existingChildData = this._nestedChildLists.get(childList.key);
- invariant(
- !(existingChildData && existingChildData.ref !== null),
- 'A VirtualizedList contains a cell which itself contains ' +
- 'more than one VirtualizedList of the same orientation as the parent ' +
- 'list. You must pass a unique listKey prop to each sibling list.',
- );
+ if (existingChildData && existingChildData.ref !== null) {
+ console.error(
+ 'A VirtualizedList contains a cell which itself contains ' +
+ 'more than one VirtualizedList of the same orientation as the parent ' +
+ 'list. You must pass a unique listKey prop to each sibling list.',
+ );
+ }
  this._nestedChildLists.set(childList.key, {
  ref: childList.ref,
  state: null,