Workflow for converting normal PR into stacked PRs

[micahjsmith]

Imagine that I have a feature branch where I've already created a PR. Afterwards, I want to stack another PR on top of this using stack-pr tool. What is the right workflow to achieve that?

What I'd like to do is add metadata to the first commit in my feature branch that indicates that it already has a PR. Then stack-pr tool should manage that PR going forward, including updating it the next time I run stack-pr submit to add the stack pointers.

Known workarounds is to commit to the current feature branch, close the current PR, just run stack-pr normally => new PRs will be created. This isn't ideal because you lose any code review on the current PR and add extra noise to the github feed.

[micahjsmith]

Another workaround that seems to work

• checkout a new branch, feature-stack from the HEAD of feature
• commit to it
• observe that there is already a PR between feature and master/main
• optionally squash all the commits in feature together, if there were multiple commits going into one pr
• reword the feature commit to include the trailer:

stack-info: PR: [link-to-pr], branch: feature

• run stack-pr view and confirm that the first pr is now "managed" by stack-pr
• run stack submit

It would be great if the tool can offer this as a first class feature or if there is another more ergonomic workaround!