ViewDocumentDragStartEvent

Fired when the user starts dragging the content in one of the editing roots of the editor.

Introduced by ClipboardObserver.

Note: This event is not available by default. To make it available, ClipboardObserver needs to be added to the ViewDocument by using the addObserver method. This is usually done by the Clipboard plugin, but if for some reason it is not loaded, the observer must be added manually.