Handle status edit histories with < 2 entries

[nikclayton]

This can happen if the edit history has not been propogated to the user's server.

Try and fetch the edit history from the original poster's server. This may succeed (if the status was public). If it doesn't then show a specific error message.

Fixes #3743

[connyduck]

I'm very much against doing calls to instances other than the one the user logged in with.

• It breaks privacy. As a user I would definitely not approve my client to leak my IP address to foreign instances. Also we would have to change our privacy policy.
• Malicious instances could probably exploit this somehow e.g. by making Tusky load 1000s of images.
• It only works with public posts on Mastodon Api compatible servers, but there are others
• Opens the door for other calls to foreign instances, and that is complexity I would very much like to keep out of our code

[Tak]

+1, we should never communicate with other instances

[nikclayton]

OK. Updated to remove that feature and be more specific in the error message.