Regression - faster activity tab in 5.13 won't sort by source_name now

The activity tab now uses the api in order to not take forever to load but I just discovered source_name sorting is broken :-( (We've had this in prod for months & never noticed).

Target & assignee are unavailable to we can do a join assuming 1->1

added regression label

WIP pr - not working but wanted to point to the places in case someone has time as I've run out today https://github.com/civicrm/civicrm-core/pull/14194

mentioned in commit f6365217

mentioned in commit a6c2ebdc

mentioned in commit ffa04b14

mentioned in commit 273b3410

mentioned in commit c2068a3e

mentioned in commit e51604e3

changed milestone to %5.13.2

closed