bug#40919: 27.0.91; next-error-select-buffer does not always behave as documented

[Trevor Spiteri]

On 28/04/2020 03:51, Trevor Spiteri wrote:
> 1. Go in a fresh next-error capable buffer (not *grep*).
> 2. Grep for something.
> 3. M-x next-error-select-buffer *grep*
> 4. M-x next-error

And I just realized, this is also a regression from Emacs 26 if step 3
is skipped, as step 2 itself also sets next-error-last-buffer .