Handle nil return from willSelectRowForItem:

UITableView allows its matching delegate method to return nil and interprets this as “don’t change the selection”. Returning nil from RATreeViewDelegate doesn’t work the same. A nil return didn’t propagate up as nil, instead being transformed into a re-selection of the current item, with the corresponding delegate calls.

RATreeView/RATreeView+TableViewDelegate.m

@@ -83,8 +83,12 @@ - (NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NS
   if ([self.delegate respondsToSelector:@selector(treeView:willSelectRowForItem:treeNodeInfo:)]) {
     RATreeNode *treeNode = [self treeNodeForIndex:indexPath.row];
     id item = [self.delegate treeView:self willSelectRowForItem:treeNode.item treeNodeInfo:[treeNode treeNodeInfo]];
-    NSIndexPath *delegateIndexPath = [self indexPathForItem:item];
-    return delegateIndexPath.row == -1 ? indexPath : delegateIndexPath;
+    if (item) {
+      NSIndexPath *delegateIndexPath = [self indexPathForItem:item];
+      return delegateIndexPath.row == -1 ? indexPath : delegateIndexPath;
+    } else {
+      return nil;
+    }
   } else {
     return indexPath;
   }