Group by shows all records regardless the filter that user had on the filter before grouping the results in Agent Workspace
Steps to Reproduce
Open agent workspace in any New York instance with demo data
On the caller column, just choose David Miller and do show matching.
On the list header click on the Group by on the priority column
Try to expand the first group
Actual Behaviour: It shows all records.
Expected Behaviour: It should show the records where caller=David Miller and Priority= choosen one.
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Related Problem: PRB1360683