Change calendars display order

[Cimbass]

The order of all-day appointments and holidays is unfortunately a bit unfavorable for me at Google Calendar:

• All-day appointment
• Holiday
• Dates with time

I would prefer it in the widget:

• Holiday
• All-day appointment
• Dates with time

Therefore, it would be nice if you could change the order of calendars in the calendar widget.

[yvolk]

Implemented in v.3.1.0
Selected event source is moved directly below the last selected source, so a User can change the order of sources (Calendars, Task lists) by selecting them in the needed order.

This feature is mainly needed for #163 - to hide duplicated events.

[yvolk]

Testing on Pixel 3 device with Android 10

1. Before calendars and Task lists order change:
   
2. Corresponding settings:
   
3. Now move "My tasks" one position down:
   
4. And see that "1. Check due tasks" event is below "2. Call me!" now:
   

[yvolk]

Implemented in v.3.1.0, please check here: #320