Repeating / Recurring Events do not propagate new location details

(Agileware reference #23949)

Using the "Create new location" option does not work as expected with the "This event onwards" or "Every event" cascade modes.

Verified on dmaster.demo.civicrm.org

Steps to reproduce:

1. Create an Event with filled in address details
2. Configure the "Repeat" options to repeat (e.g.) 6 times
3. Select the settings link for the second event in the series
4. Change the location for the event, ensuring "Create new location" is set.
5. When prompted "How should this change affect others in the series?" select "This event onwards"

Expected outcome:

• The second and all onward events receive the new location details

Actual outcome:

• Only the selected event in the series is updated
• Expected outcome is apparent if the event does not have a location configured before step 4.

This appears to be a result of `CRM_Core_BAO_RecurringEntity::triggerUpdate` being called while the edited event's `LocBlock` is still unsaved, or at least not referred to by the entity.
As each call to `CRM_Core_DAO::cascadeUpdate` loads a "from" Event with a NULL `loc_block_id`, no information is available to be propagated to other to the "to" Event.