Content of diagrams not indexed

[debrecenics]

Environment

MD 19.0 but this seems to be the case in CSM 19sp2 as well
V4MD 2.3.0

To reproduce this

1. create a diagram and add elements to it.
2. write a query that collects DiagramRepresentationObject
3. check that no elements are found by the query

Query Example

pattern representation(object) {
	AbstractDiagramRepresentationObject(object);
}

Possible issue

The UML Metamodel shows that diagrams contain AbstractDiagramRepresentation elements via its _representation feature which is marked as containment reference. However, this reference is filtered out during the indexing phase:

v4md/com.incquerylabs.v4md/src/main/com/incquerylabs/v4md/internal/MagicDrawProjectScope.java

Line 41 in db0fdf8

private static boolean isReferenceToBeFiltered(EReference reference) {