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

[Juri Linkov]

>>> 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!
>
> For searching in the _current_ minibuffer text?  How long are such text?

It doesn't matter how long it is.

Just imagine the minibuffer search as continuously searching backward
in a buffer with lines:

history3
history2
history1
history0

where "history0" is initial text in the minibuffer.

What you propose is to delete the line "history0" before running Isearch.
This makes no sense at all.