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Would appreciate some eyeballs on <https://github.com/pantsbuild/pants/pull/20505> . There may be unintended consequences I'm not seeing.

If you have a.py and a_test.py and you delete a.py then should a_test.py  be flagged as transitively changed? It doesn't look like that's currently the case either, though

OK, completely changed that PR to be much narrower. It solves the immediate issue without impacting the wider one (which is complicated) at all.

That was the problem-case I thought up. But I tried it out and found that it didn't happen on the current release either. So I guess that isn't actually a problem.
And you right, IDK how to implement that, short of identifying targets on both the current branch and the changed-since branch and doing the diff. Which sounds like it would be a lot of edge cases.

You'd have to roll back the git state to look at the BUILD file state in the past

Which is a thing we might want to do at some point I suppose