It would be nice to have an action on the Model (default package) node and
Package nodes that creates a class diagram based on all classes, interfaces,
enums, datatypes, etc., and those elements' dependencies, in the selected Model
(default package)/Package node.

A dialog should be displayed, to:
1) confirm action, because it could be a long process for pacakge with lots of
elements and dependencies
2) allow the modeler to filter based on element types (class, interface, etc)

This is similar in scope to issue 82847 and can reuse some of the same code.