bug#9972: 24.0.90; "C-s/C-r" from the minibuffer don't clear the current text

[Juri Linkov <juri@jurta.org>]

> IMO, It isn't worth making C-s (and C-r, C-M-s, C-M-r) look up also in
> the current minibuffer text, because it is usually small enough not to
> need that (how often do you use that feature?).

I use this feature all the time!

> I'd like these commands (C-s, C-r, C-M-s, C-M-r) to be similar to M-s and M-r:
> * Focus exclusively in the minibuffer history.
> * Have a minibuffer-specific prompt ("Next/Previous element matching
> [regexp]: ") so that it is clear what's going on.
> * Obviously, clear the minibuffer's current input.

If you like M-s and M-r, then just use them.  They are like non-incremental
versions `M-x search-forward RET' and `M-x search-backward RET'.

But C-s should work like Isearch, and not clear text before it starts to
search in it.