feature: Abort current implicit flow

[enricodeleo]

Allow aborting the current implicit flow. This allows restarting an
implicit flow within SPAs.

[jeroenheijmans]

Changes look good to me. I'm curious though, what is a practical scenario where you'd need this? Haven't encountered the need for this myself yet.

[enricodeleo]

Thanks for your review @jeroenheijmans.

Basically when using a SPA (for example a cordova app) if an user abort the flow by closing the browser or going back with the ios "back to app" button he cannot re-initialize (hence open the browser again) unless he kills the app.

[jeroenheijmans]

Ah, ok, makes sense.

Thinking some more on your PR, the name might be confusing without context. That is, when I'd see abort...() as a method name, I think a running process or promise chain might get aborted/cancelled. No such thing would happen with your proposal. So possibly resetInImplicitFlow() or some such might be a better name?

Possibly update the comment as well to something like "Forcefully resets the service's tracking of whether the implicit flow is currently doing work".

But both are minor suggestions, ofc.