MDL-72810, the three-month calendar pseudo block was removed from the calendar page and the following were deprecated as a result:
- fake_block_threemonths() method from calendar/renderer.php.
- calendar/amd/src/calendar_threemonth.js - whole file.
- calendar_threemonth and threemonth_month calendar Mustache templates.
- Behat step definitions _i_hover_over_day_of_this_month_in_calendar_ and _i_click_day_of_this_month_in_calendar_.
This issue is to remove those items now they have reached final deprecation.