When a Schema was edited since a user started editing it, but the edits do not conflict (e. g. someone edited the schema text and someone else edited the labels, or they edited labels in different languages), then it would be nice (but not, for now, required) to merge those changes instead of reporting an edit conflict.
Related Gerrit Patches:
|mediawiki/extensions/WikibaseSchema : master||Only prevent actually conflicting edits|
|Resolved||Lydia_Pintscher||T217338 Check for edit conflicts when editing schemas|
|Resolved||Michael||T218300 Merge non-conflicting edits when edit conflicts are detected|