bug#38502: 27.0.50; minibuffer-scroll-other-window with multiple frames

[Juri Linkov]

>>> Is S-TAB referring to <backtab>?  That is unbound (default) in this
>>> context for me.
>>
>> Indeed there is no counterpart to TAB for scrolling the completion
>> window in the opposite direction.  Maybe <backtab> and S-TAB should do this.
>
> FWIW:
>
> I'd suggest that both TAB and S-TAB (<backtab>) be left
> alone, as they are natural for completion in some way
> (e.g. cycling among candidates).

This is exactly what I meant - TAB cycles completions forward,
so S-TAB could cycle backward.