Changelogs

Make Cron scheduler available in more circumstances.
Events with the Twice Daily schedule would not be carried over when switching scheduler strategies.
Backup schedules respect the interval chosen.
Prevent multiple cron tests from being scheduled at once.
Cron test being stuck in a loop preventing a site from switching back to the cron scheduler.
Prevent warnings when a single and recurring event were scheduled at the same time.

Restore correct ordering of event lists (our thanks to Jonathan Vogel-Borne and others for highlighting this issue)

Select2 for Widget filtering allows Searching correctly again
Altered the collapse_sql logic to avoid SQL errors relating to query ordering (our thanks to Luke Kenny for flagging this problem)
Added code to avoid running the min/max coordinates query when event IDs are available (doing so resulted in database errors – props @afragen)
Fixed an issue that would generate warnings on PHP 7.1+ (props to @tanumstrand)
Fixed a typo in the Event List widget options
Prevent a fatal if a non-truthy value is passed when calling tribe_is_recurring_event()
Fixed strtotime() warnings on recurring events created past the last advance limit, props to Zoe for bringing this up
Resolved an issue preventing us from using the correct singular or plural form for years within the recurrence UI (our thanks to websource for flagging this problem)
Fixed an issue with the [tribe_events] shortcode’s Day View where it wouldn’t paginate unless the Tribe Bar was activated (props to @socialspdlc-org for highlighting this issue)
Fixed some recurring event meta data-related code that would sometimes produce PHP notices when viewing events that recurred yearly (thanks @alistek for reporting this bug)
Fixed the mini calendar widget and shortcode’s pagination to ensure that each month shows a correct list of events (thanks to @kdr4phtc for reporting this)

Added Google Maps API key to all Google Maps URLs when the key is available, allowing maps to load more reliably on some hosting environments (props to @sfdfortnight, @thor, and many others for reporting this!)
Modified recurrence dependency trigger to work with events with no ID