Fix logic error when trying to find hovered item

Was just comparing this item's and the parent item's names. But if an item has
no parents, only its own name has to match for the check to return true. Make
sure that the number of parents also matches.

source/blender/editors/interface/tree_view.cc

@@ -439,6 +439,9 @@ bool AbstractTreeViewItem::matches_including_parents(const AbstractTreeViewItem
   if (!matches(other)) {
     return false;
   }
+  if (count_parents() != other.count_parents()) {
+    return false;
+  }
 
   for (AbstractTreeViewItem *parent = parent_, *other_parent = other.parent_;
        parent && other_parent;