EDIT

Fix NPE in classification label provider

ref #6595 Preselect classification when moving factual data

fix NPE for cloneClassification

ref #6909 Directly update tree when linking with taxon

ref #6909 Fix enabling of experimental handlers

ref #6909 Add canExecute to linkWithTaxonHandler

Fix potential NPE

ref #6909 Fix potential NPE

minor

fix #7041:set the selected data to LocalSelectionTransfer in dragEnter to provide the selection in drop validation