Invalidate count() when adding single cases [#136645861]
Invalidate count() when adding single cases [#136645861]

When cases are added one at a time in DG.CollectionModel.addCases, no notification was being sent that the case indices were changed.

concord-consortium/codap,concord-consortium/codap,concord-consortium/codap,concord-consortium/codap,concord-consortium/codap