Fix initialisation error

Summary: There was an initialisation error possible if the crash reporter tried to start with an initial selection (after coming from a deeplink or the notification pane), which would cause an unending update loop.

Reviewed By: passy

Differential Revision: D29331127

fbshipit-source-id: 14e75e483c232039e6a80aa131fa5ce7c105b670

desktop/flipper-plugin/src/ui/data-table/DataTable.tsx

@@ -357,12 +357,16 @@ export function DataTable<T extends object>(
     [dataSource, tableState.sorting],
   );
 
+  const isMounted = useRef(false);
   useEffect(
     function triggerSelection() {
+      if (isMounted.current) {
         onSelect?.(
           getSelectedItem(dataSource, tableState.selection),
           getSelectedItems(dataSource, tableState.selection),
         );
+      }
+      isMounted.current = true;
     },
     [onSelect, dataSource, tableState.selection],
   );

desktop/flipper-plugin/src/ui/data-table/__tests__/DataTable.node.tsx

@@ -555,10 +555,7 @@ test('onSelect callback fires, and in order', () => {
     ref.current!.selectItem(2);
   });
 
-  expect(events.splice(0)).toEqual([
+  expect(events.splice(0)).toEqual([[item3, [item3]]]);
-    [undefined, []],
-    [item3, [item3]],
-  ]);
 
   act(() => {
     ref.current!.addRangeToSelection(0, 0);
@@ -606,10 +603,7 @@ test('selection always has the latest state', () => {
     ref.current!.selectItem(2);
   });
 
-  expect(events.splice(0)).toEqual([
+  expect(events.splice(0)).toEqual([[item3, [item3]]]);
-    [undefined, []],
-    [item3, [item3]],
-  ]);
 
   const item3updated = {
     title: 'item 3 updated',