In MDL-79434, calendar_top_controls() was removed, making calendar_sub_month() unused, which has therefore been deprecated
In MDL-84657, calendar_add_month() was deprecated
This issue tracks both methods final removal
MDL-79434 Final deprecation of calendar functions deprecated in Moodle 4.3
MDL-84657 Deprecate calendar_add_month()
MDL-84663 Final deprecation of calendar_add_month()
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