Proper cleanup of editor state if a model element is removed. Before this, switching to a editor that was initialized with data from a modelElement that was since removed would run into an error since that element could nog be found anymore. Also: implemenmtation of handleModelEvent in the Generic editor, call that first within all specific editors.
Disable dnd from the connection treeview if there is no active diagram where we could drop tables/columns on.
Separator before the edit source buttins in the SchemaEditor.
Fixed the "dirty" setting of the document, and the logic to depict that inthe schema treeview (italic schema name).