Allow passing branch/ref to diff command

[rawhat]

Describe the solution you'd like

One thing in my other git plugin(s) workflow is to diff against a specific branch. For example: :Gdiff origin/staging or :Gdiff HEAD~3. It would be useful to diff against things other than just the current HEAD. I couldn't determine if this functionality already exists, so if it does, my apologies!

This plugin is really cool, thank you :)

[tanvirtin]

Hey, thanks for the feature request. This feature does not exist currently and it would bring great value.

I think both buffer_diff_preview and project_diff_preview could benefit from this feature.

For buffer_diff_preview we would need to pass an additional option here and fetch the appropriate data here and I that should be it.

[stale[bot]]

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