- HierarchyInspectionView: don't show popups when not enough space is available.
- HierarchyInspectionView: don't show popups when not enough space is available.

zhukaixy/open3mod,dayo7116/open3mod,zhukaixy/open3mod,acgessler/open3mod,acgessler/open3mod,dayo7116/open3mod