Sort order of Task Lists

[marbetschar]

I'm not sure about GTasks, but at least for WebDAV there is a way to rearrange task lists in the backend. Instead of just sorting them alphabetically in our Tasks app, we should reflect the order created by the user.

For WebDAV there has to be a property we can use for sorting the task lists. If this is not present, we can still fall back to alphabetical sorting.

[marbetschar]

Support for calendar-order property will be added in Evolution Data Server 3.39.2+:
https://gitlab.gnome.org/GNOME/evolution-data-server/-/issues/297

[marbetschar]

if we want to sort task lists "now", we need to fetch the calendar-order property manually from the backend using lower level WebDAV APIs. EDS 3.39.2+ won't make it into Odin.

[marbetschar]

Since we are going to Flatpak all the things there is the possibility to ship a newer EDS version within the Flatpak. Therefore we should aim for this solution instead of implementing a custom one.

[marbetschar]

Support for calendar-order property is released!

https://gitlab.gnome.org/GNOME/evolution/-/commit/84b3e733a91271ad3f2554365ca13b3a3bab4955