REF: simplify Block.where (and subtle alignment bug)
- [ ] closes #xxxx
- [ ] tests added / passed
- [ ] Ensure all linting tests pass, see [here](https://pandas.pydata.org/pandas-docs/dev/development/contributing_codebase.html#pre-commit) for how to run them
- [ ] whatsnew entry

The alignment is not user-facing AFAICT, but comes up when trying to address #44597.
anything user facing? (since no new tests guessing no) Not user facing.

On Tue, Nov 30, 2021 at 5:04 PM Jeff Reback ***@***.***>
wrote:

> anything user facing? (since no new tests guessing no)
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