[FEATURE REQUEST] Start from existing open contribution when making another improvement

[jbmagination]

Currently, you need to redo the entire contribution and then make your change in one go if you want to make a change to an existing contribution you've made. Otherwise, your previous contribution is reverted in place of the new one.

That's really tedious and annoying. If you make an improvement, you should be able to start from your existing pull request.

[KateCatlin]

Thanks for the feedback @jbmagination, taking note of this with our UX team.

Leaving the issue open for others to add thoughts and upvotes.