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

[Drew Adams]

> > 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).

By default, Icicles uses `C-v' and `M-v' in the
minibuffer to scroll forward and backward, respectively.