bug#32607: 27.0.50; pop-to-buffer in next-error-no-select

[Juri Linkov]

>> But it fails when using C-o from the already displayed *grep*.
>> I think next-error-no-select should override the user setting with
>> display-buffer-overriding-action because the purpose of pop-to-buffer in
>> next-error-no-select is to ensure the *grep* buffer is displayed somewhere:
>
> And if a user wanted to pop up a new window here?

It pops up according to user setting but only when
this buffer is not displayed already in other window.