First label explicitly added to empty group is invisible (collapse and expand parent to make it visible)
Summary:
Add missing notification for row insertion
Fixes T29576
Test Plan:
- Create segmentation
- Remove last label of Group 0
- Add label
- Group 0 is expanded and Label 1 is visible
Same for other groups.
Reviewers: floca, O1 MITK Reviewer Group I
Reviewed By: floca, O1 MITK Reviewer Group I
Maniphest Tasks: T29576
Differential Revision: https://phabricator.mitk.org/D826