Notify user on unsuccesful pulls when offline

[zaeph]

Hello,

Now that I've got forge working on my system, I've been able to try things out. One of the questions I had was whether forge would allow me to work on issues whilst offline.

I've tried pushing an issue to a tracker when offline. The only indication that the push hasn't gone through is that the buffer isn't closed: no informative message. It might be useful to notify the user on those fails.

(Side-note: If we close the buffer after saving it, running forge-create-issue again asks you whether you want to edit the previous draft or thrash it. This is great, but maybe we could expand this behaviour to have multiple concurrent drafts?)

Then, I tried forge-pull when offline. It displays Pulling $user/$repo in the modeline, but it doesn't seem to time-out, or if it does, I haven't witnessed it (waited ~2 min).

magit-fetch-from-pushremote when offline lets you know that the pull didn't happen. In magit-process-buffer:

128 git … fetch origin

fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.

Not entirely informative, but I guess it'd be hard to ascertain that there's a connection problem.