Non meta-property attributes of DTO entity are erased when the entity is opened in standard editor

[gorbunkov]

Create a DTO entity with an attribute which is not a MetaProperty:

@JmixEntity(name = "me_MyDtoEntity", annotatedPropertiesOnly = true)
public class MyDtoEntity {
    @JmixGeneratedValue
    @JmixProperty(mandatory = true)
    @JmixId
    private UUID id;

    @InstanceName
    @JmixProperty
    private String name;

    private SomeClass someClass;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public UUID getId() {
        return id;
    }

    public void setId(UUID id) {
        this.id = id;
    }

    public SomeClass getSomeClass() {
        return someClass;
    }

    public void setSomeClass(SomeClass someClass) {
        this.someClass = someClass;
    }
}

We have a browser of these DTO entities. Each instance in the browser have the someClass attribute filled. When we open the entity instance editor, the someClass property is erased. This probably happens because DataContext.merge copies only attributes that are metaproperties.

The sample project: merge-erase-sample.zip