Show number of commits ahead/behind in branch overview

[vijfhoek]

Like #5326, but in the branch overview, like this:

This would be massively useful for deleting old branches, to check if they happen to have commits that aren't merged to develop yet (so you can't accidentally delete work).

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs during the next 2 weeks. Thank you for your contributions.

[vijfhoek]

Do we want to close this issue? Seems to me that feature requests like these should not be marked stale and be closed after a few months.

[morph027]

Stumbled into the same use case yesterday (after finally switching to wonderful gitea). It would be nice. Discussion here or in #5326 ?

[saitho]

I'll try to implement this feature.