EDIT

ref #6925 Set conversation and cdmEntitySession to null for dispose

avoid widgetIsDisposed exceptions by check of control is disposed

ref #6595, 6568 Open taxon name editor in editor area

• migrate taxonomic perspective

ref #6990 catch potential NPE

ref #6913 Remove org.eclipse.ui dependency from NavigationUtil

ref #6908 Migrate polytomous key list editor

• migrate some other parts and handlers

fix #6990 Migrate search result view