Icon-buttons missing in left hand panel.
Glade 3.38.1: The preview snapshot icon-button at the bottom of the left hand panel is no longer there. Fortunately the snapshot is still available from a right-hand mouse menu on a top-level widget. However it would be more convenient if the icon-button was re-instated. Similarly the "Edit..." button for GtkTreeView and GtkMenu does not appear when these widgets are selected. These special editors are available in a right-hand menu, but again an icon-button would be more convenient. The Red "D" documentation button (in Glade 3.22.2) is also missing. Automated regression testing of GUIs is not easy.