bug#14742: 24.3.50; enhancement request: be able to prepend stuff from buffer when search backward

[Drew Adams <drew.adams@oracle.com>]

> >> > 3. To me, yanking stuff to the beginning is more important than
> >> > deleting stuff from the beginning.  I was thinking either have a
> >> > separate key (or set of keys) that is (are) analogous to the
> >> > yank-at-end key(s) or else just reuse the same keys when searching
> >> > backward.
> >>
> >> I have no idea about new keys, but I need this change to implement
> >> yanking/deletion by motion keys (disabled by default).
> >
> > Dunno what that means.  Motion keys will yank or delete?
> > Doesn't sound too good, a priori.
> > Guess I missed the functional spec for that. ;-)
> 
> No one tried this feature, but surprisingly it's very convenient.
> So I could implement only low-level support for this feature in isearch.el,
> then more high-level commands could be implemented somewhere else.

Is it described somewhere, in user language?  If not, can you please
describe it?

> > Why not just reuse the keys we already use to yank, but have them yank
> > at the beginning when you search in reverse?  E.g.:
> >
> > C-w     - `isearch-yank-word-or-char', but at the beginning.
> > C-y     - `isearch-yank-kill', but at the beginning.
> > C-M-y   - `isearch-yank-char', but at the beginning.
> > M-y     - `isearch-yank-pop', but at the beginning.
> > M-x C-e - `isearch-yank-line', but at the beginning.
> >
> > Doesn't that seem natural?
> 
> No, unfortunately there keys are not natural.

Are you saying they are unnatural when going backward but natural when
going forward?

> > In Isearch+ I have even more than that for yanking.  I would much
> > rather have a user be able to reuse the same keys in the opposite
> > direction.
> 
> Do you mean a new boolean user option to define whether `C-M-y'
> should yank but at the beginning/end in a reverse search?

An option would be fine.  But why not just do it (by default)?
I don't understand why you think C-y yanking to the end when searching
forward is more natural than it yanking to the beginning when searching
backward.