Clone on copy

[nikku]

This fixes a fundamental flaw in our copy mechanism.

Until today we would carry around a mutable copy of oldBusinessObject and oldDi that would change what has been copied if the copied element changes after the copy operation:

Copy <Task> with name <OLD>
Change <Task.name> property to <FOO>
Paste <Task'>
<Task'.name> is <FOO> despite it having name <OLD> at the time of copy

Unfortunately the PR got a little bigger than intended, fixing numerous small issues and addition additional test coverage to test copy + paste end-to-end.

Contributions

• fixes the issue by cloning each element as we copy. As a result what is copied is frozen at copy time and not affected by future changes anymore.
• fixes that paste behaviors would execute when pasting both labels and actual shapes (fac5f92, verified via 076bb35)
• fix bogus meta-date being attached to shapes on paste (1f40b65)
• adds a bunch of test cases to verify paste works in the way intended:
  • keeping IDs where possible, working with serialization (076bb35)
  • verify collapsed sub-process handling (63e6e2e)

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Closes #798
Closes #1708

[nikku]

Updated as discussed.

Using updateModdleProperties did not work as it gives me now way to wire parent child relationships at the moment. We'd need at least the ability to set $parent as a special prop.

[nikku]

To be released as a new major version.

[philippfromme]

Using updateModdleProperties did not work as it gives me now way to wire parent child relationships at the moment. We'd need at least the ability to set $parent as a special prop.

You mean for adding root elements? Then we'll add this ability in the future.

[philippfromme]

We should consider fixing this.

[philippfromme]

✅