Closing a case gives a warning notice

I can reproduce on dmaster.demo: Notice: Undefined index: updateLinkedCases in CRM_Case_Form_Activity_ChangeCaseStatus::beginPostProcess() (line 148 of /srv/buildkit/build/dmaster/sites/all/modules/civicrm/CRM/Case/Form/Activity/ChangeCaseStatus.php).

To reproduce create a Change Case Status activity that sets the case status to Resolved. It's not specific to "Resolved", e.g. if you re-open a case you also get the warning.

I can look into making a PR.

@DaveD thanks for reporting and a PR could be helpful.

added sig:bug triaged labels

Added PR https://github.com/civicrm/civicrm-core/pull/14160

mentioned in commit e4ebc14d

closed