I want to be able to change both the source and target branches of a pr
In https://tangled.org/tangled.org/core/pulls/2151/round/0 this was targeted at master I'd like to point it at the astro docs branch instead as that would give a more meaningful change. I'd also like to leave the original branch in place and change the source to another bracnh.
Because of where the edit button is on the UI (next to the branch names), I expected this was actually already how tangled worked and was surprised when I couldn't do this. That current edit button should be moved until this is implemented.