Compare two different branches from two different repositories.

Compare branches from two different repositories using the API.

To enable us to use the API to compare 2 branches from two different repositories.

Proposal

Links / references

Documentation blurb

Overview

We were trying to compare two different branches from two different repos but this doesn't seem to be possible at the moment. It would be extremely useful for us to do this using the API and also the UI.

Use cases

For our development team to be able to compare two different branches from two different repositories.

Feature checklist

Make sure these are completed before closing the issue, with a link to the relevant commit.