bug#60411: 29.0.60; minibuffer-next-completion skips first candidate when completions-header-format and completion-show-help are nil

[Gregory Heytings]

> > > For completeness, you may consider also handling the case where 
> > > completions-header-format is an empty string, which is another not too 
> > > unreasonable way to disable the header. minibuffer-next-completion 
> > > still skips the first candidate for that case.
> >
> > Thanks for your feedback!  Indeed, that's another bug, which makes a 
> > fix elsewhere in the code even less likely.  It is fixed in the 
> > attached patch.  Can you try it?
>
> Yes, this patch works fine in the scenarios that I have found 
> problematic. Thank you!

Great!  Thanks again.