Support choosing checkout branch method when status is not empty

[Fatpandac]

This Pull Request fixes/closes #2404.

It changes the following:

• support choosing checkout branch method when status is not empty
• add .editorconfig file

I followed the checklist:

• I added unittests
• I ran make check without errors
• I tested the overall application
• I added an appropriate item to the changelog

[extrawurst]

Thanks for looking into this! I left the first round of feedbacks

[dotslashdan]

hi, apologies for the intrusion. i have come across this repo just now and have been poking around. i hope you don't mind but i've left a few comments and questions i have, but don't feel obligated to reply

[extrawurst]

LGTM

[extrawurst]

I have looked at this a while ago extensively. Would like a second pair of eyes @cruessler - please give it a go aswell locally, not just by code-review so we do not miss potential regressions. give me a merge_ready when you think its good