EDIT

Fix possible NPE

fix white label in referenceDetailElement

ref #7073: try to avoid widget is disposed exception

ref #5687: add possibility to search for identifier

update titleCache of collection when editing collection

fix #7126: fix wrong supplemental data if scroll in details view

ref #7073: keep the details view when clicking on supplemental data

ref #6728: update titleCache if author is edited

avoid NPE in ItemsComparator of selection dialogs

fix #7127: fix NPE and dangling meta character in selection dialogs