BUGFIX: set unique form element identifier after node copy #72
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When a form element with identifier propery is copied an exception is thrown.
@see https://github.com/neos/form/blob/3a6122db36ad2c9e6f06316653a35c80ff47dee1/Classes/Core/Model/FormDefinition.php#L553
This changes adds a signal slot for \Neos\ContentRepository\Domain\Model\Node
afterNodeCopy
addedNode
to make the form element identifier unique. This also works if a whole section having a form element with identifier is copied and inserted.Fixes #44