dev/core#695 - Make custom searches slightly less fragile

[aydun]

Overview

See description in https://lab.civicrm.org/dev/core/issues/695

Before

A custom search where contactIDs() returns contact_a.id AS contact_id does not populate the prevnext cache resulting in result selections not being saved. But contact_a.id as contact_id works - ie case sensitive.

After

contact_a.id AS contact_id and contact_a.id as contact_id both work

[civibot]

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[eileenmcnaughton]

@totten ping - this seems fine to merge but I just want to draw it to your attention

[eileenmcnaughton]

actually @aydun I think we should add this into the 5.10 rc

[eileenmcnaughton]

@aydun I merged this via 5.10 rc so it's already merged & I'm closing this #13535

[aydun]

Even better - thanks @eileenmcnaughton