I'm working on multiple topic branches. One topic branch has a lot of new features and is 17 commits ahead of master.
Now I decided to work on another topic, and branched off to a new topic. I made a commit and this single commit is ready for a pull request on GitHub. However I noticed that I accidentally branched off my previous topic branch instead of master, so GitHub is previewing me with the other 17 commits of the other topic branch. How do I move this new commit to a topic branch which doesn't have the commits of the previous topic branch?