Event instance is lost when recurring event start is moved ahead

Steps to reproduce:

• Create a daily recurring event that starts in TU and ends after 5 counts (assuming week from Monday to Sunday). Eg. from 16/04/2019 to 20/04/2019.
• Start editing the event and set the date after at "Starts on" in "Recurrence" tab. Eg. on 17/04/2019.

Expected behaviour:

• Event is moved ahead preserving the 5 counts. Eg. 17/04/2019 to 21/04/2019.

Actual behaviour:

• The end date is not computed properly loosing a day in recurrence tail. Eg. 17/04/2019 to 20/04/2019.