sync connections across machines

[robaho]

Developers these days use multiple machines. VScode can sync settings across machines, but the extension does not store the connections in a setting but rather the global context.

entries in the global context can be synced as well using setKeysForSync. This would be really helpful.

Thanks for a great extension.

[robaho]

Also see https://code.visualstudio.com/docs/editor/settings-sync#_sync-user-global-state-between-machines