RE: My emacs was upgraded and I am a novice again

[Drew Adams]

> >  M-x icicle-doc RET mail S-SPC mode line
> >
> > shows all doc strings that match both `mail' and `mode line',
> > in any order, as completion candidates.
>
> So does "M-x apropos", which is part of Emacs.

Not at all the same (`apropos' does not even use completion, of any kind).
Likewise all the other vanilla Emacs `apropos-*' commands. Read the rest of
the behavior I described (no need to repeat it). If you still don't
understand the difference, read the doc I pointed to. There is no relation
here to what you get in vanilla Emacs.

Had vanilla Emacs been able to do what I described (or equivalent, with
equivalent ease), I would have pointed to vanilla Emacs.