Fix bug in tree when search term is set

Summary: Previously we would run the effect even if search term hadnt changed causing us to scorll to a search term rather than the selected node when selecting in the visualiser

Reviewed By: antonk52

Differential Revision: D47831188

fbshipit-source-id: 5700d49aea219a1229bcc8df462e55d8508c6c1a

desktop/plugins/public/ui-debugger/components/tree/Tree.tsx

@@ -114,7 +114,12 @@ export function Tree2({
     overscan: 20,
   });
 
+  const prevSearchTerm = useRef<string | null>(null);
   useEffect(() => {
+    if (prevSearchTerm.current === searchTerm) {
+      return;
+    }
+    prevSearchTerm.current = searchTerm;
     const matchingIndexes = findSearchMatchingIndexes(treeNodes, searchTerm);
 
     if (matchingIndexes.length > 0) {