saveCustomDocumentAs
abstract fun saveCustomDocumentAs(document: T, destination: Uri, cancellation: CancellationToken): PromiseLike<Void?>(source)
Save a custom document to a different location.
This method is invoked by the editor when the user triggers 'save as' on a custom editor. The implementer must persist the custom editor to destination.
When the user accepts save as, the current editor is be replaced by an non-dirty editor for the newly saved file.
Parameters
document
Document to save.
destination
Location to save to.
cancellation
Token that signals the save is no longer required.