Dropbox will support only short-lived access tokens starting 2021-09-30 -> should support refresh tokens

[barbicels]

Any plans to enhance DropboxWebAuth to support the PKCE code flow, as will be required for all apps beginning 2021-09-30? Their OAuth flow will only return short-lived access tokens beyond that date.
For now, I’m going to subclass it so that my app will survive the change.

[barbicels]

Clarification: PKCE is supported and strongly encouraged, but not required, and it would be good to have support for it. The real requirement for dropboxQt is to support refresh tokens in the OAuth flow so that apps won't have to interact with the user when their short-lived tokens expire.