Deferred synchronization
Description
If syncing newly added tasks with Google accounts fails because the user hit the API quota limit, the tasks are discarded on restart.
Make it possible to defer unsynced items by storing them to a local file until they can be fully synced with online accounts.
Submitted by: Luka <<luk..@...si>>
Assigned to: gnome-todo-maint@gnome.bugs
Original ticket: #773179