[NFC] [Test] dev/core#1098 Add unit test & code comments relating to the slow activity search #15016
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Overview
Activity search is brutally slow due to bad joins when adding in ACLS (regardless of permissions). They need to be fixed up to use the preferred methodology - which does not suffer from these bad joins. However, first we need tests - this adds tests & some signposts in the code comments
Before
No test
After
Test
Technical Details
The issue is the joining in of component filtering - we should fix this but do it correctly....
We probably need to extend the test to reflect contact ACLs first
Comments
https://lab.civicrm.org/dev/core/issues/1098