Allow sync settings if Syncthing is installed
Over the years, one of my main frustrations using several Gnome devices has been the lack of syncing. Folders have different contents depending on what machine you're on, work you do on one machine is not duplicated on the others, and so on.
Recently I started using Syncthing and it solves those issues, but it's difficult to set up and confusing for the average user. I think there would be real value in integrating it within Gnome Settings, so that a "Syncing" section appears if Syncthing is installed.
Here's a mockup of what that would look like:
As you see, it only uses a subset of Syncthing's capabilities in order to make it as simple to set up as possible. You just have a list of synced devices, a list of folders that should be synced across those devices, and yet another list of apps whose content should also be synced.
The process of adding a new device would be like this:
Adding a new folder would look like this:
And finally, adding a new app would look like this:
All three dialogues give you the option to choose what specific content will be synced to each device; that's because e.g. you may want to sync heavy folders to a server but not a mobile device.